Well, I've thought about this and realized that I was wrong.
The reason that I'm wrong is that I didn't realize that I was presupposing that the point of sports in general is to see what the human body is capable of by itself. What I thought was that there is an actual definition of sport, but there isn't, sport is an arbitrary convention and therefore is whatever we make of it.
So, in regards to powerlifting, the more and more sophisticated squats suits become, the more and more the human body gets taken out of the equation, and hence the greater the sport becomes about the equipment. But since powerlifting can be whatever we make of it because there is there is not true definition/essence of powerlifting, it doesn't matter how much of the job suits do.
So, that's where my argument came from - the presuppositions that I didn't realize I had.