The PPCL has more abrasives than the AIO but FAR less than a swirl remover. We're talking about VERY VERY mild abrasives (Irene at TOL compared the abrasives in PPCL to talc). They won't really remove swirls, but MIGHT impart a slightly better look to an already almost-perfect finish. The AIO would remove any residual oils from the PPCL, but I wouldn't go so far as to say it would nullify any improvements. But as Abercrombie2582 said, it's a show-car type of thing, where we're talking about stuff that most people can't see.
FWIW, I LIKE working with PPCL. I sometimes use it after a SMR just to enjoy working with a nice, easy product. It really DOES leave the paint "squeaky clean". I've also used it to rejuvenate black trim.