Xbox live rape claims are obvious hyperbole because neither party was ever in the physical presence of the other. In this case it's different, because the accuser was arrested by the police so the police did have the opportunity to rape him. Since that opportunity actually existed, I don't think the claim is obvious hyperbole.
I think nobody would believe the claim in the context of xbox live, but many people are inclined to believe it in the context of an unlawful arrest. Even one of the replies to my first comment about this seems to believe the claim. (He's now been flagged for this. What guideline did he violate? I hope he wasn't flagged because his perspective lends credence to my perspective that accusing cops of raping you after a baseless arrest is not obvious hyperbole.)