That is correct. Our definition of setback is the distance between recommended mountpoint and ski center. It is still on my list of things to add the center of sidecut, but when you get into details it get complicated quickly: noise in measurement, different front/back sidecuts, and all other variations that ski designers can imagine...
What is wrong with the mountpoint of the Squad? Blister seems to say that there are two lines printed on the topsheet that are 2 cm apart, but that the one most forward is marked "0" and is at -6.2. We typically go for the most directional line when multiple lines are suggested, but if there was a "0" on the topsheet, we should have picked that line. Happy to change it.