If he wins the best thing they can do is get on a midnight flight to Australia.
Yeah i don't think it will matter a lot for the ITT. He will have very heavy legs from the Vuelta & the jetlag. Top 5 would already be on the high end.
The RR might be a bit better recuperation wise. The question then becomes, does he have enough mentally and physically to make a difference against guys who worked towards the WC and don't have the jetlag and do have fresh legs. We might very well see a Remco like Pogacar in San sebastian...