Sorry: sounds like it's a typo by a sloppy writing RO who wrote cGY instead of GY. It should have said he had 7500 cGy , which used to be called 7500 rads, which is 75 GY.
If he really had 125 GY 60 times, he'd be dead especially with IMRT; physical fact that it's impossible to survive 7,500 GY, or 75,000 rads. Shame on the RO for not correctly giving the individual doses as 125cGy.
Another typo the RO could have made was to leave out the period: if Kevin had 1.25GY 60x, that's very probable and normal, and adds up to 75GY.