Nope. Majority don't even compete in powerlifting.
Its a mixture. I have bjj guys (pan Pacific 60kg gold medalist champ)
Basketballers (national level) plays sydney kings development squad.
Nsw strongest man and 3rd recently at the nationals(ben Simpson).
100m sprinters and ifbb national level competitor at the gym.
So its a mixture.
I generally focus on pl as its a niche market and easy to run events to. But have developed training protocols for others.
Im pretty busy atm with the gym still growing.
Tbh alot of the posts on ausbb get recycled alot. I repeat myself at the gym enough already to warrant retyping it here. Will chime in if anything is of interest of course.