I’m not disagreeing that the FM radio circuit being directly connected to the trs connector is how phones worked for decades, I’m just saying that they said you couldn’t get FM radio over usb, so I assumed they must not be talking about literally receiving FM radio to the computer because obviously you can use SDR over usb. Maybe I’m just too autistic to appreciate what they were trying to say, but the interpretation I had from their comment was that killing TRS removed the ability for your phone to receive radio even including over usb, which is demonstrably wrong. But yes, your phone receiving the raw analogue signal through the TRS connector and using its dedicated radio circuit is in fact a thing, and almost certainly the better way to do it.