Even though it may be AI-generated, it clearly received a lot of upvotes, including from me, because it said exactly what I wanted to say. Why is AI a problem? You didn't explain how exactly it degrades the forum or adds nothing to the discussion.
That's not something to be proud of that you upvoted it.
It's not a discussion, unless you think talking to an LLM is a discussion or equivalent to HN.
And obviously if this is permitted or rewarded with upvotes it's just going to become an endless spam site of people posting low effort cotton candy they didn't need any thought to produce. No signal all noise
There's at least one value to LLM content: it always outputs correct grammar and punctuation. Unlike this human sentence of yours, which took me two attempts to parse because it's missing a necessary clause separator.
But on the substance of your comment, I (generally) agree.