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Do you find it impossible that someone would read a thread without an account, find a topic they want to comment on, create an account and then post a comment?

Given style and contents of the comment - yes, I think that's very unlikely. The comment looks orchestrated.

"Please don't post insinuations about astroturfing, shilling, brigading, foreign agents and the like. It degrades discussion and is usually mistaken. If you're worried about abuse, email us and we'll look at the data."

https://news.ycombinator.com/newsguidelines.html

You seem to be ultra paranoid about astroturfing.