You can see from the map that which RTCM messages each base sends. Not all bases send the same things. It would help to know with whom did you have that email correspondence?
Here is the link to the map again:
And screenshot from the base data you wanted to connect to:
The base is sending:
RTCM 3.2 messages: 1006, 1008, 1013, 1033, 1045, 1075, 1085, 1095, 1125
SATELLITE SYSTEMS GPS+GLO+GAL+BDS (MSM5)
It is absurd that such public services really have o idea what they are actually broadcasting 