

only if a magnet sticks
That’s simply untrue.
Many stainless pans have an aluminium core. Aluminium isn’t magnetic, but is very inductive.
Some stainless pans are made of 316 stainless steel. It, too, is inductive, but not magnetic.
I have non-magnetic stainless pans that cook beautifully on induction.

Gosh, you’ve posted this misinformation twice under the same OP. It’s just not true.