Lots of pros use older, discontinued models. Nike just randomly re-releases old models for the cult following and not really for the pro tour. They did this for the Oscillate a few years ago, and similarly then, no one wore them on tour. Madison Keys still wears the Vapor X. Alcaraz and Fritz are still using the first Vapor Pro. Bencic still wears the Vapor 9.5. Sinner still wears the Zero. Tiafoe still wears the GP Turbo. Dmitrov still wears the Vapor 9...so on and so forth.
Ah, the Oscillate. Best fit of a shoe ever, along with the Agassi Zoom Pounce, which had my award for ugliest shoe ever. Both fit like a glove. Honorable mention; the first McEnroe trainer, and the Air Meadow. Supreme. (I think.)