Actually he claims that he does have evidence, and that he provided it to investigators.
OK. So are you on team globe now then? I'm struggling to see how alien life would be possible in your model.
My issue with this, with my very much globe hat on, is that if there is alien life out there it's almost certainly too far away to contact us, much less meet us.
If Einstein is right about the speed of light being a universal speed limit then given the
nearest star is 4 light years away it seems vanishingly unlikely that any life out there would be close enough to visit in any reasonable timescale. As far as we know warp drives are very much in the realm of science fiction. But obviously it would be arrogant to assume we know everything.
It is interesting though that since the advent of smart phones, where now everyone effectively has a camera on them at all times, there hasn't been an explosion in clear photos of bigfoot, the Lock Ness Monster and UFOs.
In brief, I'm pretty sceptical about all this, but it would be kinda exciting (and a bit terrifying) if these claims are true.