No, the Criminal SIN is more of a fake one, but not the usual kind. The corp that 'made' him created it after he did that thoughtless hit on it's facility, and provided the SIN database with info on the 'criminal'. So the data is probably mostly fake, but it has his biometrics, detail, and such. Or it might be his real SIN. Doesn't matter much to Stryker, as he can't trust the name they issued to him. And he doesn't want to know, because it was the best thing that happened to him - making his own path, free of any bonds of the life in servitude.