147 miles for 48 hours on a flat treadmill when attempting a world record as part of a team, and in ideal weather conditions.
In this attempt after days of running, in the desert heat, on hilly terrain he runs over 150 miles in 48 hours?
His shorter times are relevant because he is claiming to have run stretches of this race, quicker than he has for any official race in his life. If he had been covering 70-80 miles all at 9+ min/milling, I doubt many people would be bothered. When he is running at 6.xx min/miling and there is no evidence he is capable of that, we assume that he is getting assistance.