Trump doesn’t have a clue what he might want in the healthcare bill. He just wants something passed so he can “win”. If the republicans voted for single payer, Trump would sign it. If they voted for an all-out ban on health care, Trump would sign it. The details don’t affect him and so he truly doesn’t care.
Nor is he upset that the particular changes in the “skinny” repeal aren’t happening – in fact, I doubt he is even aware of what is in the “skinny” repeal, despite it being a tiny 1/2 page document written in 3rd grade English. He’s just upset because he hasn’t won yet, and because some of the republicans weren’t loyal enough to make sure he won.