Again, it isn't certain, but it is certainly likely. The backstory is there. The "quest reward" element is there. The armor is there. They might have his mysterious past be that he was a rodeo clown who dodged buckin' bignorners and his final costume is a set of suspenders and a round red nose, but I somehow doubt it.
They way I look at it is this- he was originally going to be an Enclave grunt. An infantryman. A power armored jack booted thug.
Now he's a scientist.
Who's to say he's even still from the Enclave?
He might have been a scientist affiliated with a different group.
Personally, I think it would be cool if he was ex-enclave, but I'm not holding my breath.