This policy has been shared a lot by the anti-AI crowd over the last week. They are celebrating it as a major site saying no to AI.
It seems a smaller "win" than most think. Just discourages wholesale rewriting and creation of new articles using AI. Assistance with editing is explicitly allowed.
Right, the wikipedia rules are not that different from the HN rules. A human needs to be responsible for what finally goes on the page. And that's fair enough. There's some experimental (non-wikimedia) wikis that use AI for editing, but they haven't taken off yet.