400% FPL is $62,000 for a single person. Not exactly rolling in it.
This is all before including the other large personal expense (housing) for this person is likely imputed rents from homeownership which aren't counted as income but function that way.
A substantial amount of discussion in early retirement communities is about how to stay below 400% AGI, which is why I found it odd to see a criticism of healthcare subsidies going to early retirees in the context of the expanded subsidies.