Well, I have one that I bought new in 2020 and it is 1 5/8" (basswood body, white w/black guard).
It was my very first bass (long time guitar player, decided to pick it up during the pandemic for recording, then got seriously bitten by the bass bug). After doing enough research to decide that I wanted a P bass, I also decided to start with the narrower nut to be safe, not knowing how I would do with the wider one, so that was a requirement for anything I was looking at.
All the specs that I looked at anywhere the LB-100's were on sale at that time listed them as 1.625" and 9.5" radius.
I'm not sure if there has been any actual change to the specs this year or if there is some glitch going on, after seeing what others posted. I guess I would just confirm it with the seller before purchasing.
Here are some TB posts over the years noting the 1 5/8" nuts:
2016:
Fender Precision or G&L LB-100?
2018:
G&L LB-100 Tributes?
2020:
G&L LB-100: Tribute vs. Fullerton
g&l lb-100 (Tribute or US) vs Fender P (MIM or Mia)