And FTR, the 7th gen iPad Mini's screen dimensions are 2266 x 1488.
It's a double-density display, so that's
physical pixels, not CSS pixels. As far as CSS is concerned, it's a 1133x744 display.
In my skins, I usually do the "layout shift" if the device's logical pixel count (CSS) is less than 500 pixels in either dimension, which tells me that it's a phone. Anything bigger is a tablet, and those get treated just like a laptop or desktop.