Huh? Of course it has. There's a whole lot more of physical and psychical stress in the big races and they're much more demanding physical and psychical than at a race like Algarve where parts of the race are like a cycling tour for the pros.
Even if your argument has some degree of truth, doing 6.5w/kg in a 30 minute climb is a great physical performance regardless of the race in question and the Tour of Norway stage in which Evenepoel did it was actually a stage with echlons so they were not there just enjoying the views...