He’s been cycling a lot longer, from much younger.
Also he’s won and raced in lots of different ways, and very used to racing in wet, muddy, cold conditions.
Evenepoel’s youth career was mostly winning by going solo and going faster than everyone else.
Probably.
Part of a domestique's job to make sure GC contenders are properly protection, fed and watered?
He doesn't have 5-10 years of professional racing and maybe not experienced catastrophic race losing bonks yet.