Does the demagnetizer in the store affect the SSD?

Question

Solid State Drives

Good time,
the question is this: there is a demagnetizer in the DNS at the checkout. Not round with a neodymium magnet like in clothing stores to remove locks, but such a flat black surface slightly protruding from the table, a square with a side of 20 centimeters, and in front of it a pair of light indicators. Unfortunately, I don’t know how this thing works, maybe it has something to do with the “anti-theft” system, I don’t know whether the magnetic field is constant or variable there (and whether it’s a magnetic field in general). I only know that they themselves call this thing "demagnetizer". When buying an external SSD, the sales assistant put a box with a disk on this thing, I noticed it after a few seconds, immediately removed it, but the consultant had already caught a trace. Could the disk somehow suffer in theory? Not data (it was still empty), but electronics, the memory cells themselves, etc.? How can this be checked?
Thank you.