It is a reasonable question.
Warmoth mentions at https://warmoth.com/guitar-neck-string-nuts that it will work with radii between 9 - 11" or the 10 - 16" compound, which seems inconsistent with what is offered as options elsewhere on the site.
Now that a 12-16" compound is offered and has LSR as an option in the builder, if it is not a mistake or bug in the options for that radius of neck, perhaps it is felt that it will work with that also. It seems also to be offered on the website as an option for straight 12" radius.
It works fine with the 10-16 compound but I don't see the point of a 12-16 compound in the first place, 9.5 to 14 or 10-14 which Warmoth don't currently offer are more mathematically sound.