This is just sloppy. I'm assuming this was prior to the new security, but maybe the file shouldn't even be on any of their servers prior to the Japanese premiere. At any rate though, if the issue was serious enough to pull FMA, why not Phantom? So now we are where we are, I guess.
I'll also say here what I said at ANN...
It just jumped out at me that the wording is "a group" and not an "anonymous party," which is the wording they used to describe the perpetrator of the One Piece leak.