Although admittedly, a large DC pulse current along an unshielded conductor can emit a significant electromagnetic pulse...
I built some crude Capacitive Discharge welders several years ago, for spot welding battery packs for electric bicycles etc, and used a reed switch (magnetic controlled) taped to one of the cables to make them Dual pulse welders, without having to use complicated electronics. Worked like a charm.
But still, the lawsuit is complete BS.
I did the same. Bought one of those monster capacitors that the car bufs use when they install one of those body rattler sound systems.