While the climb is no doubt real, and their past exploits show that they're capable of this kind of thing, it's not clear that they made it to the top. At one point there are security people in orange vests who have spotted them and there's no footage of them at the top.
Nonetheless, that's pretty damn high up. And, oddly, it seems that the person who had the hardest time with the climb was the drone operator. According to the video's description, he crashed the drone and was fined for flying it. Though, in light of recent events in Paris, they're probably lucky that was the worst that happened.