This was something wouldn't be made up if it were 1980 or so; car radio theft was a real problem and there were aftermarket radios that could be slid in and out so you didn't have to leave them in the car. However I very much doubt it's a common problem now.
Very well aware. That’s how you know he’s bullshitting. None of his “friends” in Beverly Hills have radios in their cars. None of them are doing any of what he’s saying.
I think it's a mixture of made-up nonsense and weird ideas that get stuck in his brain, are often distorted, and come out at random intervals. Like raking the forest, or the whole insane California water spigot thing. He does bullshit, but he also does lots of stream of consciousness riffing.