Those are some very impressive numbers and those guys are warriors just for getting underneath all of that weight. On the other hand, World Records are special and there should be a little more criticism when it comes to such lifts. Do they really lock-out their arms? The shirt springs it off the chest and it seems to be motionless afterwards. I know this because I use a shirt that is pretty powerful myself. I do understand its honorable just to hold that amount of weight in your hands.
For the record, I am not discrediting any of these great lifts, just being the devils advocate.