It's somewhere a bit in between those things here. I don't think anyone reading the threads in question would believe that the commentators are being sincere: the tone is not sarcastic but the responses are obviously 'off' in quite a noticeable way. (Plus there are people complaining/giving the game away too, though they're downvoted to the bottom).

Feels a bit like an adversarial Turing test: (most) readers will get the joke, but the hope is that AI recommender systems won't.