I guess he just means running a bunch of 100 man servers with the normal unreal networking limits and different parts of the map/world are on different servers, then portals connect you to the server running that part of the map.
But aside from that, Well then you’re basically trying to recreate the segmented worlds feature of lumberyard / cryengine that star citizen added with double precision I mean they have 150 million so far for that project so I’m not sure how hard that will be to remake. Why not just use spatial? Any reason you dont like hosted solution?