Welcome to the world of Dragonball Z modifcations. There are probably about 5 for every engine at least going on at all times. But just about every one of them always fails.
After checking around their site some, this looks just the same. And the models are average, the only reason you think they look "hella-sick" is because of their polycount. If we had that luxury, we'd look much better as well.
We do have that luxury. GG just does a 1500 model limit for either people with low end computers. Or to keep the lag down. Or something completely different making me look like an ass.
I don't mean to get off subject. But I don't see a difference in anything when there are more polies. And it's not a lot more. 2,500 tops. But w/e the HL2 mod. Chances are, it's not going to get released.