So in practice it is highly unlikely a handheld magnet is going to do anything for the same reason a cloud passing overhead is going to break a rock. The difference in air pressure is too low, the energy gradient too gradual, and it’s too far away anyway.

Take the same aggregate amount of energy into a tank of compressed air, and use a jackhammer and that rock is dust in no time.

Same physics principles; radically different impact in practice.

Assuming the magnet you have isn’t the electromagnetic version of a tornado and you aren’t waving it around at several thousand RPM anyway.

The idea behind this is because running conductors through the substrate has its own issues that ironically makes it a lot more complicated than little transformers like this. It's all material science kind of stuff about how the extra steps to bond the layers conductively runs into yield issues. They also thermally flex in weird ways reminiscent of 2007 era BGAs that had problems with the shift to ROHS detaching themselves from boards. But way more fragile and you can't fix it by a run through the reflow oven.

Obviously they've gotten past some of those issues in the past few years.