1-2 being the lowest stake, we expect to have a strong win rate for a player that actually knows how to play. I would expect around 10 bb/100 hands, even more. I am unsure about the exact number, but I would say that an hour of play at a live table plays at around 30 hands/hr. This puts his EV around 4500. With an actual wr of 2000, this isn't hugely far from ev.
From my memory, I believe I read that playing 20k hands (which is about how many he played) has a standard error of around 1 bb/100. However, including things like toking, he may not be terribly far from being a decent player. But then again, maybe he's not as good as he thinks (why is he playing 1-2 as a "pro"?)
Pretty spot on post here. He's probably not quite a 10ptbb/100 player. Tokes and the rake will absolutely slaughter your winrate.