A good example of how not to do it. He started with the wrong type of screwdrivers, he needed JIS screwdrivers to avoid damaging the screw heads, I'll bet a lot of them are messed up.
The metal back to the sensor is on all cameras I've seen and disassembled, I don't know from the video how you decided it was anything special.
Somehow, I get the impression that he has a ton of money and could care less if he destroyed it.