If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.
You're right, he wasn't trying to obtain information — which isn't required for a rhetorical question, as the excerpt you quoted says.
He was emphasizing his opinion by voicing it as a question. The text immediately after the excerpt you posted says this makes a valid rhetorical question:
> ... or as a means of displaying or emphasize the speaker's or author's opinion on a topic.
