I think you missed the point. The word "accessory" is related to the training session for that day, no matter what you end sport may be. It even applies to those who have no sport at all.
You have a main lift, a compound lift, (in this case, squats) which you push hard. You follow that up with accessory work to target weaknesses. Those exercises would probably be chosen with the sport/goals in mind.
So you get stronger, bigger and more badass with the barbell squats, then get some blood pumping in there with non compound accessory lifts.
You don't have to do it that way. But it works.
Awesome.