Now I've thought a bit about this stage I'm really pessimistic about winning the Giro. He had literally 0 snap on his attack. Even in last years Vuelta he had more pop on his attacks.
He had no snap in his attack on stage 8 either. He does that now, i.e. change pace without dropping a nuke. I see it as a little tester to check his rivals & see what they've got. He did it on Lo Port in Catalunya as well in the final km when he slowly accelerated a couple of times before goading Evenepoel into attacking from too far out (something Evenepoel noted afterwards).
If we're to be pessimistic, I think the one part worth considering (in order to be grounded & not get totally carried away with expectations) is today's stage was shorter & the climbs were punchier (technically his sort of playground). But on the flipside, we know this rider well enough now to see that when he has bad legs, it doesn't matter the terrain: he gets dropped, i.e. Evenepoel blew him away in the first week of the Vuelta last year on climbs which were usually his bread & butter. He just couldn't follow.
My own main concern before today was that we were seeing an Itzulia 2022 type scenario where his knee injury hampered his performance on any climb, whether long, short, steep or flatter.
What we got has reassured me he's still in the fight because it says he's got some form & whatever problems he has haven't hampered him as much as the problems he's had in the past in those aforementioned races.