Glad you fixed the issue.
You can resubmit your sitemap (won’t do any harm), you just have to wait for Google to respider and index the new HTML output. On a small site could be reindexed in a few days, large site probably all reindexed in under a month. For the record the meta tags error won’t have any impact on your Google SERPs, so fixing it won’t have a major benefit beyond having a handful of lines of code less for Google to index and your server will be less taxed because a feature is turned off.
It’s a tiny improvement, so you might get a tiny performance improvement which could make your site a little faster to access which is a Google ranking factor: but the improvement is tiny.
You have a LOT of things you could improve in performance SEO: see your Google PageSpeed Insights Tool Results.
Interestingly it looks like you have a ton of inline CSS and JS output, so loads of inline CSS (like the theme is trying to do performance SEO by inlining everything) AND 9 render blocking CSS files.
Regarding the Yoast SEO plugin and the Stallion SEO plugin, the latter only deals with the nofollow/noindex issue discussed on the Stallion SEO plugin article: in brief nofollow/noindex is replaced with canonical URLs saving link benefit from being wasted. This can have a direct SEO value.
Whether to use Yoast SEO depends upon what you want to achieve. It doesn’t do much SEO wise, at least not in direct SEO value.
As you’ve seen it outputs an entire set of Open Graph and Twitter meta tags, also adds a meta description tag. These are not SEO features per se.
The Open Graph and Twitter meta tags are used by Facebook, Google+, Twitter etc… NOT Google search.
Sharing a webpage on Facebook, Google+ and Twitter has ZERO direct Google SEO value. It has marketing value, people on Facebook might visit your site from Facebook, but it won’t have any direct impact on your Google traffic. If a Facebook visitor adds a backlink from their blog, that will have direct SEO value, so like any method that drives traffic to a website it can have an indirect SEO benefit.
The meta description tag is used by Google, Google will use it as the description on SERPs, but again it doesn’t use the content as a ranking factor. So if you stuff your meta description tag with relevant keywords, it won’t have any impact on where your page ranks for those keywords. Consider the meta description tag as a marketing tool, see it as potential ad copy (Google doesn’t always use it). If you are listed at number 3 in a Google SERP, but your description is better than those at number 1 and 2, a searcher might click your link first (like what might happen with a set of ads). I’m not that good at writing ad copy and so don’t bother adding meta descriptions, can spend that time doing other stuff that has a direct SEO impact (writing comments for example :-)).
Most of the Yoast SEO features are like this, minimal if any direct SEO value.
It’s nice to have an XML sitemap, BUT it won’t increase rankings (no extra Google traffic). The sitemap gives Google another way to find all your webpages, some pages might be found a little quicker. If your new content is time sensitive, you want a sitemap, but for old content won’t have any direct SEO value.
Then there’s the SEO damaging Yoast SEO features, noindex and nofollow features which lack adequate descriptions of what SEO damage they can cause. Joost de Valk (the creator of the Yoast plugin) doesn’t believe nofollow/noindex can cause damage, so he won’t fix it or even add warnings!
The last time I checked the focus/keyword and content analysis feature it only looked at the Posts content (what the user adds on the Posts edit screen), can not take into account how the WordPress theme formats a webpage etc… The features output is all but worthless SEO wise.
Then there’s the robots meta tags features. You have it set to add the noodp robots meta tag to your webpages. This robots meta tag is to stop Google from using the Open Directory Project’s listing as the title and meta description for a site. Is your site indexed in the Open Directory Project? Are you having issues with Google using the Open Directory Project titles and descriptions for your SERPs? If not, it’s not needed. I’ve domains listed in the ODP, haven’t needed that robots meta tag in 15+ years owning/building hundreds of sites.
Take into account all features cost server resources, databases connections are increased etc… Any feature that doesn’t add anything should be turned off. I manage over 100 domains and I’m cheap :-) I don’t want to spend extra money on expensive servers when I can disable features I don’t need/use. In Stallion many of the features can be turned off, that means none of the features code is even loaded by the server. I’ve spent days coding replacement features that remove the need for Jquery for example, my mobile responsive menu doesn’t use Jquery: the vast majority of themes that have a responsive menu use Jquery. It’s really easy to create a responsive menu using Jquery, in comparison it’s hard to make one using CSS only.
It’s quite a bit of work to build a fully performance SEO’d site with features :-)
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