It wasn't just the hill or the lean angle. He took the draft, much stronger downhill due to the speed, to slingshot around like auto racing. Like everyone complains never happens in F1. He's definitely doing as much as he can with leaning off but it's still a bicycle, you can't really get off to put a knee down. If you put the inside leg down so the outside leg was high enough to get off to the inside, you would scrape the inside pedal.
Granted this is not a TT!