So Bob Lazar's story has always been an interesting one, did you know that way back he actually created a series of videos outlining his experience and he did it in a way that it explains complex things that even a layperson can digest?
Hearing it direct this way makes way more sense than trying to understand it from a third party article about his story decades later.
What he says about the heavier elements simply not being possible on Earth makes sense, hence why he was part of the reverse engineering team at the time at S4. The craft he says he witnessed "working" and the way it is described using gravity A waves are principles we understand better today thanks to advances in technology. But at the same time it points to a depressing projection of the future of humankind. Because to get those elements in order to leverage those gravity waves, you'd need to be in a star system where they naturally occur, to then be able to mine/harness their properties. We aren't anywhere near that kind of system. Alpha Centauri? That's a 4.2 year trip at light speed let alone anything lesser which would be the eventual reality of the capability of the technology humans would have in generations to come. You'd need to physically be there to acquire those elements, so a settlement out there solely for the prospect of mining and building the technology using those elements, then bringing it back to Earth which won't take any time at all because new gravity engines.
The bigger prospect is that if all this is true, then another civilisation out there lucky enough to be in a star system with those elements figured it out and built those technologies to cross distances of space without physically having to travel at crazy speeds.
He says in the video that the beings showed photographic evidence of our history going back 10,000 years, which means they've been watching us supposedly. Imagine the ramifications if this proof became public - Always amused me the thought that some recording device from another civilisation was mooching about the galaxy recording life as it evolves on each planet waiting for the day for that life to become intelligent enough to appreciate its existence in space and time, to then present them with a record of how they came to be.
Nice car though