The biggest red flag is: "I don't care anymore, I hope they sue me", and saying they're about to contact reporters.

It's designed to boost credibility (this is gonna be proven legit, any day now! skeptics will look dumb!), but then why hasn't he gone to them already? Texting a Signal number takes a second. Why would he take additional legal and financial risk for fake internet points on a minor subreddit known for its fanfic?