It also looks like all the other sites follow the exact same HTML conventions and styling. Some are done in PHP and some in ASP (...) Since you found "birdrating.com" on themeforest, and since they all follow similar conventions, it's plausible that the others come from themeforest as well.
On the other hand, he says he's like the guy who does finish work on the underside of a cabinet and indicates this is why he's not exactly happy with his financial situation. (I am not a hacker, so I can only infer based on his remarks, not judge what he's posted in terms of a portfolio.)