Yes the video does address this very point - somewhere towards the end - about 100.00. He says that Lazar could be delusional and/or brainwashed, but if this were the case you would expect this fact to show up in other areas of the man's life and behaviour - but apparently it doesn't .(The point, which could be crucial, is not really dwelt upon however).
The - somehat irritating -host - Derek Vans Chaik - did study Politics and Behavioural Science (whatever that is) to B.A level, but otherwise he now seems to work as a Financial and Banking adviser of some sort. I can find nothing to show that he is an expert on Body Language - and I'm even not all that sure that there is such a thing as being `an expert on body language`. I suspect that one may know a lot about this subject but that it is always opent to varying interpretations, much in the way that translating from one language to another is.
I am sure I have read somewhere that sociopaths can be very very good at faking `good` body language signals. As for lie detectors (another thing inevitably thrown in there) - pah! They are not used in courts of law, I believe.
For some reason - and as a UFO believer - I have always found myself ill-disposed to Bob Lazar and his claims. It's not just the old too-good-to-be-true effect. It's also that so much of what he says sounds so childishly simplistic.
The idea that we humans have somehow `reverse-engineered` craft of the kind that can cross interstellar distances at superuminal speeds, for example. That would be like scientists from the early Eighteenth century reverse engineering the latest smart phone, for example! (They wouldn't even have had the slightest idea of what they were looking at!)
Then so much of what Lazar comes out with tallies conveniently with the dense mythology set up by certainn American ufologists. So they are from Zeta Retiuli, they have been genetically enginerring mankind, he - Lazar-was a part of the `Majestic 1`2...and on it goes (even Van Chaik feels a need to distance himself from some of that stuff, tellingly).
I suppose this could just be my own prejudices though.