Most likely because these were captions on the cops' bodycam footage, so viewers who watched it probably did not get any impression that he was claiming to be literally raped.
"raped by the NPD all night" seems to clearly reference (evidently fictitious) off-camera events.
I don't think you are reading that the same way most others here would.
Yeah, no. In the context, it's an obvious hyperbolic metaphor. Nobody was meant to believe that it referred to real rape, no reasonable viewer would have believed that, and most likely nobody did believe that.