This sounds to me like the opposite of “supercooling” - where you can actually have liquid water below 32 degrees F, as long as it’s extremely pure and undisturbed. Dropping a flake of dust or shaking it can cause it to almost instantly freeze. Interesting in a lab, but not very useful.
B-field suppression threshhold is far more extreme than a few degrees at our current level of knowledge. I’d like to read more. Curious now...