Their UI is such a cluster fuck when considering multiple clients but condensing it down to a usable format is an in-game advantage.

You posted 2 other videos after the one you linked in this thread, in the multiboxing magic vid you had a few click button (name??) where you activate it, then mousewheel down to send commands to select clients via round robin.
VFX aside, i think this is what got you banned, because on their server side logs youd have a sudden bunch of input across a few different clients very very quickly.