Then you must have screwed something up.
Because the critical rebuild patch doesn't do anything to a fresh install of the English GoG NWN Diamond.
People repeat what essentially amount to old wives tales with no actual basis in fact, as "fixes" for NWN.
No need to be so hostile. It worked for me, so it may work for others. It certainly cannot hurt to try. I didn't "screw anything up", it just didn't work from a fresh install.
A fresh GoG install is bit for bit identical, to the 1.69 patch. The patch does nothing to a fresh English language install.
I actually verfied this because I was tired of people giving this useless advice.
I did a fresh install, made a backup copy of it, applied the patch and ran a file comparison.
It changed no files.
It does nothing to a fresh install.
This is right up there with changing your CPU affinity...