The way the 5G is tested is entirely wrong. You cannot use speedtest as the max speed will depend on the slowest link to the speedtest server. Since this is a localised 5G test lab, you should do a download from a server local to the 5G lab. Furthermore, the basis for true 5G speeds will require a full optical fibre network, I don't think the lab facility has full fibre network, thus the speed limitation is 1Gbps because of gigabit connection (as shown in the test results).