I wonder what % of wikipedia articles do have substantial portions of AI-generated text by now (and is it really a problem, providing the information is accurat

I wonder what % of wikipedia articles do have substantial portions of AI-generated text by now (and is it really a problem, providing the information is accurate - in fact in most cases I can't even imagine caring too much either way if something's written by a bot, but I do care if it's hallucinated BS).