This is not true. Dongle compatibility comes in EU (eu country) for sure. Just to be clear: it is currently in the final phase of testing.
the 4g option was there in the first FW version, but its deactivated in the latest FW because EU tests...
Latest update from inside DJI i have heard yesterday:
"Currently DJI is testing the 4G dongle in Europe. Soon it is tested and stable, it will - after accepting by the EASA - proceed to the M4P's in the EU. It took several weeks from now."