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Not sure I follow.
Yes, it shows that, but also, the tweet shows that Contador agreed to let Landa go. Aru was the weakest of the three. Contador could have tried to keep up with Landa and drop Aru again (which was a bit awkward).* It's difficult to know who would have won, but Contador certainly had a shot and by not going with him he, maybe not gifted, but made it much more possible for Landa to take the win.
Or I'm missing something.
That tweet confirms Aru letting Landa mop up bonuses that would otherwise go Contador's way.