Lots of things have diagnostic additions which make little or no sense out of context. If the units include equipment meant for deployment in rural and remote China, having multiple comms modalities would be net beneficial.

all modern high end vehicles now come with the risk of a low bandwidth feed on all the time. A friend was told to drive to a garage because they remote detected issues in lubrication before he got an in car diagnostic message.

Take the equipment out of context, that comms feature might be built in even if not requested.

Since solar power inverters are not exactly military and high security stuffs. I'd appreciate that they at least give the brands and models so that we can check by ourselves.