esjeon is simply wrong; this study is not touting the accuracy of wikipedia's knowledge. It's touting their bot's ability to accurately convey wikipedia's knowledge. It's very much about the qualities of their bot, not the qualities of wikipedia.
When the Ukraine Russia war came out, they made a banner about a ukranian translation project that had existed for years and made it look like some project to support Ukraine, effectively breaking neutrality on the war subject (which was unrelated to the translation project.)