Bunch of baloney. Follow the money.
If this is true, the Tall Whites helped America leap frog over other nations in exchange for being able to stay in the desert. We even built them an underground base.
Paul Hellyer is making public known, well long before most people believed in aliens.
UFOs are CIA toys.
There is also a guy in Australia who writes a lot about the “tall whites”.
There is no “money” to follow—these books are rather obscure:
https://www.amazon.com/Children-Orion-Cryptoterrestrials-Ryan-Musgrave-Evans/dp/B0932CX9WM