Yep, plates matter too. It sounds like he is getting Rogue calibrated plates, so he should be good there.
As far as bars go, I have used a few in competition. I haven’t competed in USAPL, but they use a power bar for all the lifts, most power bars will work. Deadlifting with a Texas Power bar (28.5 mm) is easier than with a 29 mm bar though. So that is something to look out for.
For squat bars, I don’t think it matters much. A Texas squat bar is fine IMO. I have used the Kabuki squat bar and really like it because the entire shaft has heavy knurling. Their power bars I have used are $600 pieces of garbage though (avoid their coated bars as they are slippery).
For the deadlift, every competition I have ever done has used a Texas deadlift bar. It has the most whip out of any of the deadlift bars I have used, and the knurl is nice too. All the popular deadlift bars have a 27 mm shaft, but the Texas deadlift bar has really wide collars that place the weight farther out. This is what causes it to have more whip.
You can see the Texas deadlift bar on the bottom. Because of the wider collar it is effectively like having an extra plate that weighs 0 lbs as a spacer.
You can replicate the feel of a Texas deadlift bar by using one bumper plate on a different deadlift bar (it will not be exact, but I doubt you can tell a difference).
Anyways this is my bars 101 rant.
I am patiently waiting for @T3hPwnisher to tell us how silly this sport is.