When playing the 1.16.5-1.2.0 version of the mod I can not seem to locate any naturally generating structures, and the related commands do not appear to exist. The only command that does anything (of those that appear to be related to this mod) is /dungeon which teleports the player to a world of randomly generated stone.
Even in a plains at (0,0) there is no sign of Babel or any other structure.

I have managed to locate mithril ore, but otherwise nothing.

The commands thing is just due to not updated documentation, the danmachilog command was removed in 1.16.5 and instead replaced with just a /status command for changing status, and the other things have just been logged on a debug level for now.

Also the /dungeon command acting weird is due to lag interfering with the teleportation, running the command twice usually fixes this and has you go to the correct thing, but it'll probably be fixed in the next update.