Didn't realize there was some real world concept behind this.
And it makes sense. Yellow fits Akko particurarly well.
It's quite heavily modified though. That system is based on 4 discrete types (yellow, red, blue, white). Croix's chart doesn't even contain white and is an (inacurate, cyan should be corrected) RGB/CMY continous (12 parts is more continous than 4 at least) circle.
I guess Trigger just invented their own system inspired by that one.