Based on this 4-minute review video linked earlier [1], it seems it's not actually a QWERTY keyboard, but rather a custom scheme where specific finger-movements correspond to specific letters.

They say the five vowels are the basic tap on each corresponding finger, and other letters are more complicated.

They show and mention an app that trains you how to use it; think Dance Dance Revolution and other timed 'arrow' games where you have to tap out the correct response.

I think it'd be better if it assumed homerow placement on a QWERTY and worked from there -- to be able to calibrate it to your hand, e.g. by typing a little bit on an actual keyboard to pick up the placement of your fingers for each letter. There's an app idea.

[1] https://www.youtube.com/watch?v=Pq3exdcbU7U