The part about current pictures of the S4 site. Lazar would claim they moved the location long ago (as would many top ufo researchers) so logically the site wouldn't look exactly like it did when Bob Lazar (claimed he worked there in the 80s). So this is a factor that seems to be ignored by the person talking with Alien Scientist. I haven't watched the rest of the video but I don't see the pictures taken (not seemingly showing hangers) as debunking his claims for the said reasons. Remember Area 51 became a hotbed for ufo seekers after he came out publicly, so it would make sense they moved the operation somewhere else to get away from scrutiny.