It’s impossible to ‘take heat energy from magnetic fields’. It’s magnetic energy by definition.

Yes, the technology has some arguable advantages. But a huge disadvantage is that you have physically move the material between the heat sink and source. It can’t be connected to both at the same time and be expected to work. So it requires moving parts, will then make noise and ultimately the advantages are diluted.

Comments on size, cost, material content? This is what’s really interesting.