Yes, but it's worth mentioning that the break consisted of opening up the phone and soldering on a bypass for the carrier card locking logic. That certainly required some skills to do, but is not an attack Apple was defending against. This unlocking break didn't really lead to anything, and was unlike the later software unlocking methods that could be widely deployed.

Well he also found novel exploits in multiple later iPhone hardware/software models and implemented complete jailbreak applications.