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I think it's unlikely in this case. They seem to have gone out of their way to show a method that can achieve replication using very common materials and pretty much medieval-grade technology (except for the vacuum pump, maybe).

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In theory, you could produce this in the medieval era if you had mercury.

https://en.m.wikipedia.org/wiki/Sprengel_pump

Just imagine some society discovering superconductivity on the cusp of even starting a technological revolution.

Ok, if that's the case, why the imperfect demonstration? Why not dozens and dozens of videos showing such a monumental success in action? The lack of clear evidence, especially with social media frenzies, is a red flag in my opinion.

It looks like they rushed to publish, trying to get their name out first.

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