Yeah I see that. I don't know about you but I observe many skiers in the back seat and if you ask them, most will say they are in balance. I think a big danger here this that the powers that be are trying to redefine established terms and contexts. I think of balance as the relationship between mass and force (be it gravitational, linear or circular). This redefining can only lead to confusion. As a verb, balance is defined as " to keep or put (something) in a steady position so that it does not fall." If you go out to Merriam Webster they have 9 definitions of balance!
So if you read #1 below, it says: CONTROL the relationship of the CENTER OF MASS to the base of support to direct pressure along the length of the skis. That sounds like an active use of mass not a resultant. I just see Pandora opening the box.
I don't really. Skiing is skiing. You're always welcome to bring what you have to the table so long as it makes conceptual sense, is doable/teachable, and improves outcomes. I've yet to meet a good instructor that doesn't have a few of their own thoughts and opinions... I think one could make an argument that balance is still a skill, and I doubt that it would kill ones teaching ambitions.