Interesting read.
Ni dominants are still Js — INTJ, INFJ — but I get the point (their last function being “perceiving,” Se.)
It doesn’t matter what order the N/S or T/F is in for J vs P — only the orientation of the functions.
Introverted perceiving function (Si, Ni) + extroverted judging function (Fe, Te), in either dom/aux order = J
Extroverted perceiving function (Se, Ne) + introverted judging function (Fi, Ti), in either dom/aux order = P