First game, AlphaGo looked ambiguously weak until end of mid-game when it suddenly looked very strong.

Second game, AlphaGo looked obviously strong throughout.

So the probabilities are maybe not entirely wrong.

For reference I am 4k rating, somewhat below darkforest(1d amateur) and so very very far from 9dan pros that AlphaGo is beating. Usually, pro matches are hard to understand but the excellent commentary and abundant community analysis helps greatly.