This is his plan. I think it is a lot harder for BB's to come out of hollowtech type systems than on square taper as they are under compression so imagine he will be fine, but obvs not for customer bike.
Probably has to be actual Hollowtech (or FSA MegaExo), since GXP, UltraTorque and PowerTorque are all handed to some degree above and beyond the threading.
This is his plan. I think it is a lot harder for BB's to come out of hollowtech type systems than on square taper as they are under compression so imagine he will be fine, but obvs not for customer bike.