Not necessarily.Some riders who managed to win something worth mentioning, have had a great season?
If Toms Skuijns win RvV it's been a great season no matter what he does otherwise. If Pogacar wins Liege but nothing else it's not been a great season for him. I think that's pretty obvious.
Still this is not at all relevant to my point about "removing the big wins" a rider actually won to argue the season doesn't look that good.