According to the manual, the receiver is integrated in the power cable. Even without an internet connection, traffic information came through while travelling.

Yes, but in Switzerland it has no longer been possible to receive traffic reports directly without a paired mobile phone since 1 January 2025 because the data provider SRG has secretly discontinued this service (applies to both TMC via FM and TPEG via DAB+). I don't know whether it still works abroad - it will vary from country to country.

A year ago, the USB-Garmin cable with a traffic receiver was

The plug for the cigarette lighter including the corresponding power cable is included.

The traffic radio receiver cable is only required if the radio does not support Bluetooth.
If the car radio supports Bluetooth, the traffic radio is transmitted using this radio standard so that no cable is required.

Most of today's car radios support Bluetooth. Unfortunately, mine doesn't, because it didn't exist 23 years ago.

Hello
I don't know. There's a cable but it's never been tested.