It's waiting for peer reviews, but if you understand what quantum well is, you could probably understand the claim.
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It is waiting for reproducibility is what it is. It won't matter much if it got published today in some no name journal -- a journal is going to gamble just as this youtuber did, for the slim chance of this being true (not saying it isn't)
Also, a quantum well is just particle in a box. Nothing fancy about it. Guy mentioned tunneling a lot but tunneling happens in metal, semiconductor, and insulator. Doesn't really mean anything. In fact if you need to tunnel, that means there's a chance to back scatter, so it won't be superconducting.
Click-baity ass headline does nothing to bolster the actual claim. Not-published equals hype machine that will likely amount to nothing and change nothing.