This is nonsense.
Being fat takes literally no effort at all, all it takes is your discipline slipping a couple nights a week. Being a healthy weight takes (for some) perfect discipline every day, ignoring hunger, putting weight management before everything else in your life, etc.
I've worked physically demanding jobs in paralelll with both long distance running and weightlifting for about 15 years of my life, I've significant muscle mass and good enough cardio to run 15k any day without any particular prep, yet I've hovered around obesity mark for the last 10 years. And now as a parent, any effort to cook leaner food takes time I dont have, as does exercise.
I'm not on any weight loss drugs as I do not want to risk any negative side effects, already being a sleep deprived toddler-parent.
But life is short, and cutting weight can fuck with people mental and physical health a lot before things get better, so for those that need it, 100% do whatever it takes to get to a healthy weight first and then figure it out from there. Spending your 20s-30s-40s struggling and failing to keep a healthy weight is a slow death of its own.