They could, but two things go against that. First one is it doesn't suit Rogla style all that much and the second is Jonas actually wants to attack early in the climb.
So such tactics would go against both expectations. And then again do they really need bait? Maybe Pogi should let Rogla go, as bait. Who knows. We'll see.
Vingegaard doesn't always attack early, and especially not when he's up against Pogačar in the Tour. And unlike this year, I don't expect there to be the same kind of uncertanty regarding Pogačar at the start of next years TdF, which makes it less like that Vingegaard will risk anything in the first part of the race.