Old news, but I doubt he came out
I'm probably late, but anyways...
I do believe there are more bisexual men than what stats record and it's highly unlikely that among so many famous actors there's not one bisexual among them except for Ezra Miller. However, I don't take seriously interviews or quotes as evidence of them coming out. Most of the times, the actor has been joking or his words have been taken out of context so the magazine can sell more stories.
Straight or not, I don't expect him or anyone else coming out as a bisexual man anytime soon.