I'm not sure about that. He also had the "be careful what you wish for" tweet, which indicates he had something in mind if the vote was to step down. Also, I can't imagine he planned to put so much energy into this one part of his empire forever.
It's a common political tactic to make statements that can be interpreted one way or another. On average, people will read it the way they want to, and yet the statement will never be wrong.