The stable version of the Revamped Playable Ghoul mod gives an invisible/unnamed perk to the player character that causes them to be immune to radiation, while it isn't the mod's fault specifically, it is from the vanilla human ghoul race having this perk fixed to it and because it is not meant for player usage it comes with issues, specifically to get rid of it. 

If you're like me and didn't like the rad immunity or maybe you uninstalled the mod but the perk was still active, you've tried to get rid of it without success.
The only "fix" I found was the command player.removespell 001B1FF4, but it was only a temporal fix, as in my case the perk came back every time I loaded a save or entered a power armor. 

So, I wanted to get rid of this perk and learned how to tamper with FO4Edit. I tried to outright remove the perk from the human ghoul race (didn't work), tried to remove the spell from the perk (didn't work), and tried to remove the effect from the spell (also didn't work). Instead of removing values, I decided to simply change them to something else, and it worked. Specifically, I changed the effect of the spell, instead of being rad immunity I changed it to be a barely noticeable AP regeneration buff. And somehow the perk doesn't even show up in the perks tab, and it hasn't come back since, so I declared this as a win.

I wanted to upload this, since I saw a lot of people unhappy with this issue. It's also a very good mod so I was happy to assist with this bug.

You don't need to have the original mod installed for this fix to work,
but you do need the original mod if you want to be a ghoul