One of the main reasons it's not played very often is because you need an admin to change the time limit and even then 9 minutes is not enough to finish the map.
I know it's never going to be a very popular map, but if it could at least be finished, it could be a refreshing change from all the overplayed ze maps like parking, shroom forest, lotr maps, death star, etc.
Also that thread you linked is rendered largely irrelevant by the fact that there is a pool of water at the bottom of the stairs, which prevents zombies from getting an unfair advantage: