Wikipedia:Signs of AI Writing

Recently, Wikipedia made this meta page of how AI was used in its revisions of its pages. AI on wikipedia qualifies as speedy deletion/reversion(an article can be deleted/reverted without counting to 3RR without discussion if its AI generated) so its important that wikipedia is able to detect AI writing. Page is below:

It’s interesting to see how there are still clear differences between human written and AI writing, so I need to ask why the AI generates these style of writing as the most likely form of communication to the end user on a given prompt?

And how would AI work if it was trained to mimic wikipedia’s editing style and would it be harder to detect on wikipedia?