It is the power data of a great climber if he is alone in that distance, not the best possible, but good, but he had the help of his team to do that, especially Poels, and later the help of TVG.
I dont know the wind and another factors, but considering that is not too much, he can improve that for sure, and with doping he could improve that more, although for the real champions, doping dont improves so much as in other riders.
He must not be very far of the numbers he was doing by following the favourites (most of then doped, although that year doping started to down clearly) in Croix the fer at his first Tour de France.
But of course he was young, he was starting cycling compared the rest of the peloton and now he is a much better rider.