For those of us who have rode the TS SX kits in the past we know the idea for matched ski and track width is not just a dream.
The SX kits were setup more to jump so the suspension spring/valving was honestly its biggest hindrance in deep snow performance, otherwise they went incredibly well in the deep snow even though they were 2" narrower. Also the track design was not optimized for that width it was just cut down. The increases in agility pretty much outweighed the flotation for those who were able to take advantage of it. The aro bridges the gap and adds the agility without being only setup for jumping which was where the SX lacked.
What I do know from the narrower SX kits of old, the narrower kit feels SO much better behind your feet, much less heals kicked out resulting in better control more like the OEM dirtbike that you can grip with your legs and ankles.
So for the aro, the slightly narrower will float a tiny bit less from a surface area standpoint, but coupled with the properly matched ski width, less weight and track optimized for the width you are still going to go through the snow better since the ski is riding mostly in a previously packed rut and with the driveshaft up out of the way there will be reduced drag on the front of the track as it comes around.
Snowbikes are a system just like a sled. Guys get hung up on one specific thing like say attack angle. Like oh this sled or bike has a bad attack angle so it can never work as good as others. WRONG. The whole vehicle is a system and all parts of the system working together is what creates a good working rig, not just who has more square inches of flotation, attack angle, overall weight, etc.