Let's say Dumoulin does a bike switch and does the ITT 30s faster. Then he's still beaten by 50s by a non ITTer who didn't have the legs to attack Roglic 2 and 3 days ago.I think it's a bit about context as well. For example, Roglic is an amazing time triallist, in the first two weeks of stage races. Not all that great in the third week.
Dumoulin and Roglic rode the climb slower than Van Aert, Barguil, Landa, Martinez, Mas, Bilbao etc... And barely beat an injured Quintana on the climb. They clearly were quite a long way from their best here.
I think we should try to put Pogacar's ride into some perspective. And shouldn't pretend that he put a minute or two into the best Dumoulin or the best Roglic.