Worth mentioning is that this is not the first demo of a cubesat with electronic propulsion, among others MIT has flown an electrospray based thrusters on several cubesat missions, for example Aerocube 8 [1]. There are also larger missions planned, with claims that it should be possible to achieve roughly 1km/s of delta-V with their devices in a 3u cubesat.

[1] https://spacepropulsion.mit.edu/news/aerocube-8-cd-launch-mi...