<< All 1.2ghz+ Thunderbirds and all 1ghz and 1.2ghz Athlon MP's are unlocked. >>
Change that to the vast majority, and you'll have it correct. Definitely not all of them. When the T-Bird at 1.2GHz was first released they were almost always locked originally, though it's pretty much the opposite now. Still, even now you will come across the occasional AthlonMP and T-Bird 1.2GHz+ that's locked.
I've seen a few T-Birds that are 1.4GHz that are locked, and a fair handful at 1.2GHz that are locked, as well as a couple AthlonMP's.