Beside love at home, he will likely receive some sort of supercompensation from the tour, which was essentially a very hard prolonged training block. Maybe they are banking on this. Does it live up to a proper altitude build? Almost certainly not. But doing the double is uncharted territory anyway.
Residual fatigue *should* be a problem at some point. Still it would not surprise me if either he is just superb, or comes in a little rusty, has a few very good performances, and fades during the latter stages.