When I added this mod to my rampant, fixed map (almost) all enemies were removed as expected. Removing the mod yielding enemies and spawners permanently gone. Description stated that they'll all come back.
It only happens if you expand your territory or otherwise trigger new spawners to appear. The biters don't return in areas that were already cleared, although they can expand into that area
Well, it doesn't say it will restore the biter spawners or the biters. Just that biter spawning is allowed once again. If you have a better suggested wording, feel free to make a PR or just comment on it here
