There are so many people here trying to defend their feeble attempts at day trading. It would be hilarious if it wasn't so sad. This is how I know the study has power - it has inflamed so many people for literally no reason. You'd think you just told them God doesn't exist.
Spend some time listening to Schwager, the only person to actually chronicle the stories of supertraders. I have read each of his books, and of the HUNDREDS of traders he's interviewed I can think of 2 or 3 that qualified as "day traders". Keep in mind these people are at the top of their game and only 2 or 3 of them can day trade.
Get off your high horse and accept this the first (of likely many) proofs that day trading is a mostly fruitless effort. You only stand to win with this study. If your ignorance keeps you blind I will be happy to take your money as a swing trader. In fact, I should thank you ahead of time!