If that was the objective of the investigation (that he was making it all up), that was the wrong objective. How can you prove something like that?
When it comes to UFOs we must look at the burden of proof. UFO enthusiasts make an outrageous claim (that earth is being repeatedly visited by intelligent, alien civilizations). So it is up to them to prove their claims, it is not up to the scientists to debunk them.
The reason for that is simple, countryboy. We are all subject to hallucinations; many times we are unable to interpret what we see, especially at night in the sky. Even educated people are prone to that. That is why you see UFO sightings by pilots, scientists etc.
That doesn’t mean that there is anything to them. An analogous example would be a magician performing magic tricks. We all get fooled by the magician. Even intelligent, educated people get fooled. Does that mean that there is something to the magic? Of course not.
It the same with UFOs. Our eyes, our vision, our brain plays tricks on us, it happens to the best of us.
Again, if there is anything to the UFO business, let the UFO enthusiast prove their claim (by producing body part of a creature not known to biology, or by producing a metal or construction material unknown to modern science etc.)