I got the impression Dumoulin was saying he had the same experience in Bergen when he won the ITT World Championships, i.e. his power meter was showing such huge values because he felt so good. Like being "in the zone".
Other than that, what's really evident here is the complete lack of emotion, joy, or any genuine thrill from the yellow jersey wearer at winning the Tour again. I mean the contrast with the tears, bro hugs & dancing at Monte Lussari when Rog won the Giro two months ago is jarring.
Maybe that's just the way Vingegaard is (& the race situation aka the victory was already settled on Tuesday) but the whole endeavor has a workmanlike corporate feel without any fun. All followers of the Tour see is a dude who has wife who is ten years older than him, a daughter &... that's it as far as his defining character traits go.