Not gonna say whether I believe AF cheated or not but...
This picture doesn't seem legit. On the top pic, zoom in on the mid screen and you can see Ezreals bright yellow hair. Judging from the position, he's running right past the inhibitor tower.
On the pictures at the bottom, if you look at the minimap Ezreal is right between outer and inner tower. And according to the time stamps, this happened at the same time.
Other differences that might be relevant:
At the bottom right of each pic, one is in English, the other Chinese.