I'd bet good money the 5G is only used as the last mile from the operator's phone/tablet, assuming he even is using 5G and didn't accidentally leave it connecte

I'd bet good money the 5G is only used as the last mile from the operator's phone/tablet, assuming he even is using 5G and didn't accidentally leave it connected to Wi-Fi (not that they'd notice any difference, because again 5G is not adding anything new here - the heavy lifting is done by the good old Internet).