Well, I remember Noxious having a way of preventing buffer overflows.
What they did was create a very basic looking spawning point that is walled off so less of the map's materials and shit had to be rendered at once upon joining the game. I dont know if this works, but, thats what nox did
AKA an RSO bunker.
Lotsa spacebuild maps have them too.
All it is, is just a sealed room, with no leaks, which acts as if it's completely separate from the rest of the map.
With no enitities or events to render, players would be able to connect to the server just fine, although the teleport could still cause a RSO/BO.
Regardless, he's talking about games like ZS, not wirebuild.