They look atrociously bad, if some future version of this produces high definition video then i'll be delighted. This seems like a clever but not useful shortcut to 3D. For now this goes in the could but couldn't pile.
I would recommend looking at David Johnston's book "Random Number Generators, Principles and Practices" to get a handle on how complicated evaluating RNGs properly is. Radioactive sources combined with conventional circuits/electronics are too slow for practical applications afaik (e.g. incredibly time consuming to prove the performance but not bad in principle). However, I love the banana idea for its inventiveness.
Yes, its essentially nonsense and seems to come from some quarters of the academic community as well as a marketing/differentiation technique. In reality there are:
PRNGs - pseudo /deterministic,
CSPRNGs - crypto secure pseudo /deterministic,
HRNGs - hardware based (this can refer to anything from roulette tables to zener diode noise),
QRNGs - where the entropy source is quantum mechnical in nature.
Yeah, no denying other factors but repairing that electron microscope is no walk in the park and it prob enables others to do it even cheaper given the walkthrough style tutorial. I'm just replying to a pretty flippant characterisation (see top comment) and not ignorant about other issues relating to circumstances and location like you mention.
His videos are an excellent educational resource that everyone can access easily. He's following that style (e.g. Applied Science) that is valuable for others wanting to learning how to build technologies without all of the fake complexity and grandstanding/secrecy that can sometimes accompany it. Nothing wrong with that!