He lost time in the descent because he didn't push it. Why take risks when 1) you are cooked, 2) there is nothing to gain?
As for the climb itself, yeah, he held Sunweb wheels longer than expected, went deep, then did his classic instant 1 km drop.
I just wish he could have stayed with the Fuglsang/Bilbao/other dude trio. No real reason, just to make it look less bad.
Still, while his GC days are 99% over, I don't completely write him off for next year. He has repeatedly stated he has struggled a lot to find good form this year, it is not a stretch to assume that beside age it was the f*cked-up schedule that messed with him.
Also I would be interested in a power analysis, just to check how far he was from 2019 performance.