A SIM card is not a GSM/GPRS/3G/4G/5G module.
A concealed tracking device in a sealed spare part? How would it be powered?
Why buy Chinese spare parts for a car?
The quality of the text is pure rubbish and probably fake news.
Are you really that ignorant of how modern cars operate and how they're constructed?
They are FULL of electronic modules that no one outside of the factory has any idea of how they work internally. MANY of those modules are made by outside vendors including many made in Malaysia, Singapore, Mexico, Canada, and yes, mainland China. All of those modules have electrical power provided to them so it would be trivial to power a tracking device and/or some kind of communications device. Most, if not all of those modules are bought by the trainloads from the OEM and the car manufacturer simply takes the module from the box and slaps it into a car with no inspection. So a company in say, CHINA, could install tracking equipment in something like an Air Conditioner Control Unit and it could be easily installed in new cars without anyone outside of the OEM knowing that it was there. And those modules are never repaired and are only replaced, so no one would even know that it was there. A lot of the newer automatic temperature control AC controllers also have a small vent that points directly into the passenger compartment, nominally to monitor the cabin air temperature but it would be a perfect place to install a microphone and be able to listen in on any conversations in the car.
Modern cars also have Data Buses in them so if you have a GPS then that data is available to EVERY device that is connected to the buss. In my OLD 2000 year model Mitsubishi even the vents for the AC, defrost, heat, etc was controlled via the data buss. One on the drivers side and another on the passenger side. In my 2010 Ford even the radio is operated and fully controlled by the data buss. In my wife's 2016 Hyundai Sonata, even the mirrors and seat position and a number of other things are controlled by the data buss and the car's computer recognizes each different driver based on the key in their pocket and it then adjusts the mirrors, etc to suit that driver. My wife's Sonata also knows where you are at all times and it DOES radio that information to Hyundai. When we had the tire pressure get low in one wheel, the car not only told us that it was low but also gave us directions to the nearest Hyundai dealership! I don't suppose that you know anything about the systems in modern aircraft that continually report all electrical and mechanical readings back to the aircraft company but I can tell you for a certainty that Hyundai is doing that much, and possibly more. We get frequent notices from the local Hyundai dealership that tell us the status of the car and when to bring it in for service. I've even seen things like low windshield washer fluid being reported.
This is not proof that what the OP said is true but it is damm well technologically possible!