Lots of ultra distance runners and cyclists eat and burn more than that. The point is with sufficient exercise it is almost impossible to stay fat.

And the counterpoint is that most people aren't able to do that much exercise. Because it's A LOT. Basically full time athletes or highly physical workers. So that excludes all people with a sedentary or only partially physically demanding work.

Sufficient is a lot. If you eat a fast food meal (burger, fries, soda) above maintenance you're looking at half a marathon to burn that off. And most people aren't pro cyclists that are able to sustain 400 watts+ for a hour.

Sufficient is a lot, but it’s nowhere near as extreme as that example makes it sound.

That’s a half marathon for a 150 lbs fit person, running efficiently. A 250 lbs person who is a little out of shape will burn that in a 2.5 hour walk.

Obviously 1300 calories a day above maintenance is extreme for most people, but energy expended scales non linearly with weight. There are also a lot quicker ways to burn calories than marathon running.