No. It means that when logged in SL, the map will retrieve the tiles (level 1 only, i.e. one sim per texture) from the web server, instead of retrieving the textures from the asset server. The world map itself will be unchanged and still allow the terrain-only maps (but with slower, asset server textures), or at least for as long as LL creates them (there have been talks in the past about deprecation of the asset map textures, but with the fiasco of viewer 2 and how LL is now forced to keep v1.23 around...).
So far, and AFAIK, no OpenSim grid is using that capability neither provides web-based maps, so again, I'll not loose my time on this for now.