I can think of no reason to disbelieve this. That said, I DO wonder why he waited all this time.
I used to scoff about this stuff and dismiss it out of hand until I heard someone ask why there were zero allegations of UFO’s until after the first nuclear detonations in the history of the earth......which the questioner described as a “flashlight in the dark” of the universe, which would quite naturally attract the attention of extraterrestrials.
They've been around for a long, long time. There is an interesting site that shows ufo's in ancient artwork.
http://www.dudeman.net/siriusly/ufo/art.shtml
I printed photos from it last year but I can't pull it up now, however when you search for it, it will take you to similar sites. Many of these were shown on a television program too. It's very interesting.