The author is quite ignorant about GPS trackers, as the article said it would be illegal to put them into cars. Every car and pickup made since around 2023 has one. The surveillance folks need the vehicle VIN to figure out the signal given off for each vehicle, which makes it somewhat inconvenient.
I purchased a signal detector, figured out which circuit is the culprit giving off the signal, and pulled the fuse for that circuit.
The best surveillance device is a little Trojan Horse called the cell phone. If you don’t want to be tracked via cell phone, just pull the battery. I’m willing to bet the J6’ers wish they had while sitting in DC dungeons.
Most phones now have a soldered battery that can’t be removed without major surgery.
I have a 2025 car. It has it's own phone number to download app updates and do things like remote start and find my car. The car also has bluetooth and wifi for CarPlay. I doubt if any people are going to turnoff those services.