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Not wrong, but the issue is complex. Drones are very obviously one of the bullets in any upcoming conflict. It’s not really about spying and phoning home, it’s that it would be insane to try to tell China “hey, don’t invade other countries mkay?” And then say “oh also we need ammo to stop you but we don’t have the ability to make brass cases or gunpowder anymore, can you send us some”.
Now, while we “can”, to some extent, manufacture components and complete systems, the thing about a war is that it’s basically a wizard duel but with money hoses. You can’t win if the Chinese are producing slaughter bots for $500 ea and the US equivalent is $100,000 (literally). Congress is praying that this will light a fire under US and more friendly foreign manufacturing supply chains to invest more because they might have a chance of breaking into a lucrative market. That said, it probably just paves the way for a two tiered market where China makes their slaughter bots for $500 and the US makes them for $50,000 but all the civil use cases get caught in the cross fire for the short to mid term…so everyone still loses, just harder.
RF analysis is kinda difficult, you’d need to take the car out into the middle of nowhere and have access to fairly good equipment. A tinySA would maybe work if you’re very patient but data transmissions are generally very bursty so it may be difficult to nail down where it’s coming from in a sane amount of time.
One option would be to try to figure out if there are any FCC filings for your car. All filings will have pictures of whatever module is being used and what antenna systems it uses which may give you a good idea of where it is and what it looks like. There should be an FCC ID mentioned somewhere at the beginning or end of the cars manual. Googling that should bring up some stuff.