They are discussing the new law that prevents minors from being forced into "gay reparative therapy." Now, he does more than simply make the claim that half of gay men were assaulted, he claims that the CDC published the study that says this. As far as I can tell this is an outright lie since I can find no such study posted on the CDC's website. I can't even imagine why the CDC would be interested in these numbers, since it's an issue of psychology not disease. So either he is very confused or lying, but since he doesn't provide any references to this study he quotes we cannot judge for ourselves.
Further there is ample evidence that reparative therapy does not work. The APA has an article about reparative therapy here. The law in California will prevent parents who from forcing children who are gay into a program that does not work and will likely cause real psychological harm. It seems a wise move for the government to pass laws preventing parents from forcing their children into "treatments" that have no known efficacy and even have been shown to cause harm.