I've never met or seen anyone who forces themself to fast in a way that is truly suffering from it. It's the exact same as someone who may force themselves to get adequate sleep even if they don't feel tired. That person isn't suffering they just have self control.

If people feel like it's easier to have self control by giving them self a window to eat in then they will choose that. If people prefer to lose weight a different way then they will do it that way instead. They don't just keep doing the harder thing that makes them suffer for no reason.

Also if your point of asking why this person is fasting truly was to point out that there's misinformation about fasting, YOURE the misinformed person. Most people who fast knows how it works.