It's 100% another bot account:
https://news.ycombinator.com/threads?id=Zakodiac
This one's a bit clever in that it actually comments back.
I feel like I've been pointing them out too much lately so I wanted to wait until somebody else did first.
They all seem to take advantage of accounts that are a few years old with zero posts and then suddenly make a bunch of AI-generated comments on a single day, like this one did (account from 2023, no posts until today.)
The last bot I pointed out that did the same thing ended up having its "owner" make a post about it that didn't get any attention: