Earlier quoted context omitted.
Maybe they are not regulating radio receiver usage, but the just the possession of it, which would be a separate kind of regulatory space.
All radio receivers have local oscillators built into their receiving circuitry that actually transmits energy that can be detected by specialized receivers.
All efficient radio receivers....
It is possible to build radio receivers without such. I built a crystal set as a child that could power an air piece without a battery using only the AM signal.