First i am not a member of Team M33, so I can not speak for them. Dark_Alex made that claim after he commented about the leaked source. In my honest opinion, I think Sony did read that source. And naturally they did make some changes. Also the IPL is completely encrypted. IPL is the Initial Program Loader, that part that start the PSP up after you flipped the power on switch.
Have written that, it must give Team M33 some more trouble on creating an new cfw.