He was pitching 7 innings in Indy in April, and skipped one start at the end of May, quit making things up. In fact, he only threw less than 6 innings once, and it wasn't because of some imaginary limit.
He should have been pitching those innings in Pittsburgh, not Indy.
He threw 7 innings because he got though them in 89 pitches and they needed to keep him stretched out.
It was well documented that he was on tight pitch counts, generally around 85 pitches. If he was at or above 85 when the next inning began, he was out of the game. That's a 5-6 inning limit (usual metric is you want to get through each inning in 15 pitches).