Wikimedia Product/Component responsibility#Skins mentions skins that are no longer deployed on WMF wikis, and it probably shouldn't.
Topic on Talk:Wikimedia Product/Component responsibility
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That outdated box is inaccurate. Modern and CologneBlue have not been removed from WMF wikis. They are hidden in preferences. They are retained for existing users and can be revealed using a special query string: https://www.mediawiki.org/wiki/Special:Preferences?useskin=modern
Those 2 skins are still deployed (e.g. https://en.wikipedia.org/wiki/Foobar?useskin=cologneblue), for users who had them set in their preferences, the skins are just not selectable via Special:Preferences anymore.
But possibly the table needs to be updated to add a row for Skin:Vector/2022?
I've updated the table. Vector 2022 is part of Vector skin. I've clarified that too.