Yeah, deleting everything in the mod besides that one folder does nothing since the GD file itself doesn't have the script, It's just being told what script to run as far as I can tell.
As for the other regarding upgradedata.GD, it's exactly the same. It just telling me what script it's supposed to run, not the script itself.
I don't know where this SlaveSiblingModule is. I didn't find it in my search.