Your opinion is worthless. In the opinion of the Follica team, that study is legitimate, and they are betting their careers on it. Show me one study that validates your "opinion". I don't care about some random people on the Internet who think that gushing blood means you're doing it right. "The deeper you wound the more hair you get, bro." You'll excuse me if I don't take their anecdotal failures seriously.
ETA: Also, keep in mind that most people who have tried dermarolling are the old and desperate who have already tried everything else without success. Those people aren't the best test cases, they are the ones who nature is determined to keep bald no matter what.