It's one of his tweets.
https://twitter.com/Jonathan_Blow/status/693202734703472640
Some fun stuff there.
you know, judging from that tweet and the guy who responds to him, it's questionable if he actually CAN spot a pirated copy. the streamer with 3mil views responds and blow "no comment"s him and the guy posts up his steam receipt to prove he bought it. lower in the comment thread, blow says outright that they didn't add any funny business into the game for pirates.