Its in the wording
It takes a smaller "leaner" jet to keep things equal at 100:1 vs 50:1. Oil is thicker, so more oil you need bigger jet thus richer to keep things equal flow wise.
So a 35 pilot would be too lean but a 40 might be just right when using a 50:1 mix vs 100:1
Plus at sea level equals more air equals bigger jets thus richer vs say 5000'
As said more curious what everyone is running pilot jet wise and include oil ratio, elevation, temps, even oil type as some are thicker than others.