I dunno, I don't find him a credible witness/accuser - he killed Michael in carelessness with risky injections to help him sleep, and now deflects to the father's parenting skills while feeding a conspiracy theory I've heard before, that Michael was somehow given female hormone injections or something to counteract normal testosterone levels in a growing boy...
The headline is misleading too, equating these alleged injections with "chemical castration" which implied his testicles/penis were, uh, eliminated... To use the vernacular, he was saying Michael Jackson effectively had no balls...
So the guy that killed Michael with injections is pointing to father Joe Jackson and basically saying, "Um, but that guy gave Michael injections too, durrrr..." and with no evidence, no clear claim that Michael told him about it, just "speculation" against a guy who is now dead that can't refute it...