All names end with a realmname - even on the non clustered realms - big mystery why.
What do you mean? If you mean the PvP cluster you’re rigth - but then one PvP cluster is inhabited, the other not. All 3 PvE servers are one cluster.
All realms indicate “low” and with the realm numbers as they are now, and I think they would show “low” even if you counted players in the clusters and not on individual realms, as I sincerely doubt any of them would pass the limit to “medium”. (What is the limit? I do not know!)
Realm list should - as I have already once suggested - indicate clustering. To cite myself:
I fully agree that the solution now is less than optimal 