Maybe it's because he wasn't serious in the first place?
The dude just wanted to brag about his body fat %. Around 9% is where you don't even have to flex to show your six pack. The guy is at 7.6%
I haven't had to flex in months to show off the six pack indeed.
Heck, I'm now looking into gaining about 5 lbs of muscle mass so that while I don't shed body fat, I'll shed body fat % more (it's summer and warm now, I can ride in a T-shirt on the motorcycle just fine).