I'm not a fan of the idea that you gain an advantage, but once you see you miss the corner in that situation I can understand(not condone it) though. But it's actually that to me, it looks like the tires unlock, he turns in, then chooses to turn away from the corner and take the faster route. I think he could have made a very slow chicane, knew that and chose the faster option which I think deserves a big penalty. If you miss the corner completely, IE if he'd locked up and was past the corner when he unlocked I can understand putting the pedal down.
They really should have strips across there like they have at Monaco so you have to weave between them if you use the run off there to make sure cars slow down and lose out.