Probably talking about what folks call the "repeater". That hack didn't work for me and most others. Will occasionally work intermittently for some, but is not a reliable fix.
Just replaced my module tonight, repinned the plug and swapped out the trim ring with the brushed Denali one, flipped the pad and everything is working perfectly.
I sent an email inquiry to GM Parts Xperts, the company I ordered module 13507652 from, and this is their reply cut and pasted:
The part number that you order changes to part number 13521066, they are the same part.
Hopefully we are all good.
Well, I ordered it as well as the Mouser plug. Hopefully, it's the correct one. I got the number from my dealer which he said was the correct part number for the 2018. I guess we will see...