I think this tutorial achieves what it set out to do.
I did not have a problem understanding personally.
However, this is outdated now with newer patches.
I know in reforged there is in-editor support by default now, I suspect the same is true for the classic editor, provided you have the required patch.
I am considering approving this for the sake of supporting older versions (and potentially non-reforged) but I am not sure.
Regardless, I think you could clean up the thread a bit with a colored title, perhaps an image or two of the before and after. Test map maybe? Link to tools used.
Leaving it as pending for a bit in case you want to update it.