In this context they aren't referring to the keyboard as "mechanical". They are indeed all mechanical. Mechanical Keyboard is just short for "Mechanical Switch

In this context they aren't referring to the keyboard as "mechanical". They are indeed all mechanical. Mechanical Keyboard is just short for "Mechanical Switch Keyboard". I can see how it would be easily confusing for someone not into the hobby. Buckling spring keyboards do indeed count as mechanical switch keyboards. I haven't used one since I was a kid but they were very cool.