He's shown nothing but amazing recovery in every race ever, except the Giro of which we know he had an extremely limited prep. But yeah, "recovery is the issue". Oh, he can't sprint like van der Poel? He should retire then, because obviously Bernal, Carapaz and Pogacar they blast van der Poel out of the water. You're comparing apples with oranges just whatever fits your argument. Let's ignore the fact that he's a woldclass ITT'er as opposed to for instance Bernal, but hey, that's just a minor detail for a GC rider, amirite.
Or we could wait for him to get in decent shape before judging his recovery in a GT. We could also try to remain realistic and realize he, nor any other GC rider, will have the same punch as van der Poel. And we could try and be honest with our assessment regarding his GC skills, and include his TT. But of course, that's just my opinion.
He has shown as much recovering ability in the Giro as he has shown in any race before, I mean the longest race he did before was 7 stages and until that point he was on 2nd place in the Giro GC. It wasnt until stage 11 he started to look worse. Anyways we cant draw many conclusions from all that for the his future as a GT rider.