@chadmove
Artists should never reveal their tricks to preserve illusion, but maybe this time. ;)
Yes, I only copy-pasted a small part of ground nearby to fill the hole. Copy-pasting in Supersplat is called Duplicate. It works just like deleting, but some more steps: You select splats, from Edit menu choose Duplicate and then use Move and Rotate tools place copied splats to a new location.
This is like copy-pasting textures in old 2D image editors to fix images. Nowadays those have Healing tool to make it easier or atleast better looking. Maybe some day soon such tools would be in Supersplat editor aswell. Therefore I don't think one should try too much became a master in this method.