But actually though, he's not wrong. Waymo, Tesla self driving mode, they can remote shut off any tesla they want, people have hacked cars before, it's kind of a whole thing.
They seemingly haven't showed their entire hand just yet, so far waymos only forcibly detain and (legally speaking) kidnap people when they detect [CRIME] rather than driving them to the police station, but there's no reason they couldn't do that, it is physically possible, the only thing stopping it is "the guy hasn't pressed that button yet" in essence, but they likely will.