You're not sure whether a guy talking about UFOs is telling the truth or not??? Has he provided any proof whatsoever or do all we have is his word? Is Craig Wright Satoshi??? All we have is his word and also a lot of lies and misdirection and I think the same of Bob. These guys just lie their way into infamy and that's their business model as they make money from trying to sell conspiracy theorists books and public appearances and so forth. Lazar is full of bs and this is just how he makes his money.
Lazar claims he earned a master's degree in physics from the Massachusetts Institute of Technology (MIT), and a master's degree in electronic technology from California Institute of Technology (CalTech); however, there are no records of Lazar attending either MIT or CalTech.[5] Furthermore, Lazar was not a member of a professional body.[citation needed] Lazar speculates that his academic records were erased in an effort by authorities to discredit him.
https://en.wikipedia.org/wiki/Bob_LazarReally??? There's really no hard evidence of anything he claims. Photos?? Videos??? Documents??? Nada.
There's also a documentary on him: Bob Lazar: Area 51 & Flying Saucers. Doesn't give you any sort of proof though just a whole load of talk. This drawing he did is practically the only evidence he provides in it:

What is it that makes you inclined to believe him exactly? I think Tom Delonge from blink 182 on Joe Rogan made a better case but he's still crazy.