Google always finds better ways to serve the best content related to the user search query. In very recent past google changed its algorithm. Now it display the content based on the query string and place of the user.
If anyone write without valid content and do keyword stuffing in their post(s) or Page(s), then their site will not get good rank in the google search results. Those who are providing valuable and fresh content need not worry.
Yoast SEO just gives you several options to improve your SEO and googlebot or crawlers will find the central idea about each specific post or page. So, webmasters can write SEO friendly content more efficiently. If any one want to go with just KeyWord Stuffing without fresh and valid content, then obviously, even after Yoast SEO guidelines followed, google will treat that the site is just a spamming one. And there is no reason if such posts or pages or sites served to the user who search at Google.
As long as you put efforts to avoid KeyWord Stuffing, maintain with good content then you don’t find any negative impact on your site. So, latest google update will restrict the sites having spam but not for just using Yoast Plugin. Every webmaster must look at their content from their sites visitors or users perspective to get google juice. If you don’t need google juice to improve your site’s organic traffic, then no need to worry about all these.
