if you read their comment history, you'll see they're a regular on Q stuff, and the subreddit it's on is QanonCasualties, so it's not weird for them to bring up Q at all.
I think the point the person you’re replying to was making is that belief that there are believers in a QAnon conspiracy theory is actually itself a conspiracy theory. Through that lens r/QanonCasualties is itself a weirdo conspiracy sub.