Hot air/gas, hot water/liquid, and a hot solid behaved very differently. The numbers depend a lot on what’s being measured. There’s also a big variable of time.
The cheap induction stove is not really measuring anything.
Its PWM has been tuned to get to the temperature the user selects, under whatever testing conditions they had while R&D. The displayed temperature is just the user selected temperature.
But setting it to 120(whatever unit) manages to make good enough french fries, so that’s fine by me.