The word "first" is doing a lot of heavy lifting here and has jackshit to do with it supporting it. Why? Because the overwhelming majority of Android users aren't using a keyboard and are using a touchscreen. You could even extrapolate the woeful state of Android tablet UX, because there's far more Android tablet users than there will be keyboard users because hey, most Android devices only ship with a touchscreen and are cellphones.

An iPad can support a keyboard too. It's a touch-first device.

A Mac can support a touchscreen with a third-party driver, but it's a KBM-first UX and support of the touchscreen is horrible in most apps that only accept one input at a time.