Radiologist/Biomedical Engineer here. I once did a review of the physiological effects of magnetic fields as was our current understanding in the last decade. in general, things that get altered with sufficiently large magnetic fields: - Cardiac electrical conductivity - Muscular electrical conductivity - Fibrin (protein necessary for clotting blood) meshes get distorted - There is DNA genotoxicity, and mutations start to appear - Diamagnetic effects start taking over (Most extreme demonstration I've seen so far is the levitating frogs and grasshoppers, which seem quite content afterwards, so no ill effects apparent)

Bottom line is that pretty much everything in our bodies that contains water can be affected by a sufficiently large static magnetic field. Some critical physiological processes may get disrupted way earlier than the atomic distortions cited in the article, so I believe much less than 100k Tesla would be needed to kill a person.