I have heard it among guys who work on pinball and arcade machines. It might be less common now, but next time you encounter an appliance repair tech (like microwave ovens) ask him/her.
They use "Cherry steam" as a way to describe the stem, but only really generic, $20 amazon keyboards ever use the word Cherry unless they actually have Cherry switches. A lot of newer, more boutique boards don't use Cherry, there are a lot of new and interesting Cherry stem switches not made by them.
Pretty much no way a $20 keyboard can have Cherry switches. Even the highest volume (MX Black) are ~30 cents at quantity, so a full set of keys for a keyboard already comes in at ~30 EUR.
The article claims so, though the generic usage must have died out long ago:
> the company quickly became best known for its electronic switches, particularly its microswitches, which (despite not being first to market) became commonly known as “cherry switches.”
That says their microswitches became known as "cherry switches". That is not the same thing as a generic; all microswitches being known as cherry switches.
Some people do call very good (but not good enough) chinese clones cherry switches too. Or mostly anything that is mechanically identical to a cherry (though in 9 out of 10 times, quality will be poor if not from cherry themselves)