Van Aert says it's not well suited for him, because it has more than 700 meters of altitude, but although that is actually more than the second ITT in Tour de Suisse had for instance, it's not as hard (though it is also longer, of course). He also finished fourth on La Planche des Belles Filles last year, and he won't face Pogacar here, so I think it's a weak argument in itself. He might not be the top favourite, but he can definitely win a medal.
Speaking of that TdS ITT, I see that Mäder has been given the second Suisse spot. It'll be interesting to see if he can also outdo Küng on a course like this, if he's still in good shape.