Any time people say “he” “appears” I believe it is false.
That’s my opinion, based on the warning Christ gave.
So, yes it could be human. But these other “manifestations” are false as well, IMHO. (IOW not really Him)
Which is to say any “appearance”, “apparition”, “image” etc. before His REAL Second Coming at the end of the Great Tribulation.
Or meeting Him in the clouds, which I believe (IMHO) are two separate events.