Cosmic / Eternal gladiator back

Is it possible to buy this back appearance from Shadowlands PvP? I’ve been trying to find it with no luck. I bought an ensemble from the vendor in Oribos for Warlock but the cape it comes with is a recolor of the Warlock specific Sepulcher appearance. I know there is a priest version that is all white but the one I linked should be usable by all classes (and does appear in my warlock’s uncollected appearances). There is also an eternal gladiator version.