This mod is a more inefficient and bloated version of singlenode. You can run a fresh install of Luanti, create a new world, select the singlenode mapgen, and create the same thing this mod does, without any new configuration.
Code review
This mod only removes the flags for v7, and assumes v7 is default, which is strange. There are other mapgens, like singlenode.
There's a lot of unnecesary comments. As a general rule, only make comments when you need to explain why you did something that isn't obvious. Don't make comments explaining how the API works, thats what documentation is for.
This mod uses voxelmanip to completely undo the previous voxelmanip from the mapgen, very inefficient.
For some reason, this mod also changes all the mapgen aliases to air? This seems redundant.
It registers its own water and stone, unnecesary bloat. I understand this is to fix a bug but there has to be a better way. Singlenode doesn't do this.
It can only generate air, unlike with singlenode, which can be configured to use any node.
This mod is a more inefficient and bloated version of singlenode. You can run a fresh install of Luanti, create a new world, select the singlenode mapgen, and create the same thing this mod does, without any new configuration.
Code review