This guy got a form of it working. https://www.youtube.com/watch?v=9q_IvxWoY4E

Is it a joke? He claims to be able to solve pain in most diseases with basically the same fusion device:

https://primerfieldfoundation.org/issues-treated

He cites three papers on Cell, Nature. The one on Nature does not seem to be related to this "array of magnets"

https://static1.squarespace.com/static/54d7e4ece4b0a551f3b3a...

I am very skeptical of the claims made on their website. Basically heals (almost!) everything, for the price of 1200 euros. It has all the properties of a scam product.

fission could power humanity forever and already works

To be pedantic, fusion also already works, just not economically!

Likewise, fission: costs too much to bother.

Fusion already powers the planet. We just need to build out the solar panels and wind turbines to collect as much of it as we care to find uses for.