I'm sorry for the confusion, I will word that differently in the next release.
The KUKA|prc message refers to the toolpath reduction inputs, where you can additionally reduce the complexity of a toolpath, which in my experience doesn't work so great in Fusion.
So you can leave the Fusion settings at the default!
Tolerances of 0.1mm and less will also lead to HUGE files. Always consider that your robot is probably less accurate than 0.1mm, at least when you calibrate the tool manually it's VERY hard to get better accuracy than 0.15mm. The same applies to the mechanics of the robot.