USDA recommended internal temps are all for store purchased animals.
As said, with freezing solid and then holding it there for 48 hours then after thawing and cooking at a low and slow temp I have no worries at all at eating pork at the temp I did.
If it was either a home raised swine or even a wild bear, I'd hold the frozen for at least a week and then cook to 160 degs just to make sure.
NOW! All bets are off when it comes to salmonella OR E. coil i as neither is affected by freezing so cooking to a proper temp is essential.