Obviously, Gekko Moriah is pretty funky looking. I understand that his horns and wings are articles of clothing but his size, neck, and leek-like appearance are strange. In a forum discussing fan theories concerning the nature of "minkmen" someone wrote that Oda confirmed Moriah to be a human (as opposed to fishman or snakeneck) and therefore "anything is possible". I've been unable to find his source.
I am not asking if Moriah is a snakeneck or minkmen as I believe they have not yet been shown/identified by official sources. What I am asking is: are there any official sources that identify whether Moriah is human?