I think the "metabolic privilege" idea is roughly correct; I come from a family with very little obesity (my brother lives and eats like shit and is still in amazing shape: not jacket but 0 fat)
I can eat whatever however much I want and I don't gain any weight, now I'm trying strength training thrice ax week to see whether that has any effects
Ofc not the actual causal reason but the framing is not misleading or unvirtuous