Lmao, I wouldn't want to share a room with someone else with one.
For anyone not in the know, when I said discreet I meant modular switches like MX or alps. Buckling springs all share a common barrel plate and sending assembly. It is why you can't just have a single loose buckling spring switch really.
They are right though. Check between the barrel plate and the metal back plate. Model Ms use a trio of membranes to detect key strokes. It is part of why they sound so much deeper, more robust, and less pingy than model Fs. Model Ms are membrane keyboards and that is a good thing.