That's frightening and tragic and awesome all at the same time.
To lessen risk of developing PTSD from watching that, I'll mention that right at the end he explains that there IS a process in place for access and buying stuff. Or free, if you are a museum. He gives the contact details.
So it's not a case of "look at this Aladdin's Cave of retro treasures, and you're too late, now it's all bulldozed, ha ha."
Which was what I thought it was going to be, through most of that video.