That leaves 17 weeks til September and 81 lbs(163) to make the standard weight limit per Reaper. That comes down to a 4.75lb/week average weight loss.
IMO, that is a little to ambitious a goal. He ought to give himself more time to lose the weight slower/healthier.
He is setting himself up for disappointment ... possible health trouble if he tries to maintain that kind of weight loss for a sustained period of time.