Installed the mod, only other mods were rate-calculator & editor extensions. Used it on Nauvis (explore / bombard) and chunk exposure / generation didn;t work, and ALL of my radar / map-view visibility vanished.

Removed the mod and it wasn't fixed. Can now ONLY see detailed view on Nauvis if I walk around looking with The Engineer, all remote view of the surface is broken.

Loading a save from before installing the mod has resolved the issue.

It doesn't manipulate map revealing in any way through code

Exact same thing happened to me as well. Used the remote exploration and the remote view is completely broken now. If the code doesnt modify exploration then the base game should handle this mass exploration imo. Why shouldnt it? Factorio is about scale right? I made a bug report:
https://forums.factorio.com/viewtopic.php?p=690793
EDIT: After some time the issue will fix itself as the massive amount of chunks requested will be generated and everything will return to normal. See the bug report I linked above for more info.