If he doesn't fall into the trap of starting too fast and running out of steam... i think it's possible tbh, mainly because of the "big 3", there is none that has had a perfect preparation leading up to the WC. Roglic contested 2GT's this year and is said not to be 100%. Campenaerts didn't race for 3 months after struggling with fatigue, and Dennis is clearly mentally not in the best place and also hasn't raced for 2 months. We also will need to find out if his unbranded BMC will really be big enough of a factor to turn things around. Then there are two guys that would have been a big threat for gold that are injured (van Aert & Dumoulin).Honestly I'd be quite shocked if he wins. I know he is phenomenal, but to win a WC ITT title as a 19y.o. neopro, it'd be crazy. I don't believe it, sorry.
Maybe I'm still underrating these youngsters. Even for Pogačar I didn't believe before the last week of the Vuelta that he'll end up on the podium.
So basically, it's a bit more nuanced than "19 year old kid to beat world's best".