Many more N1K1-J were built, about 1000 as I recall without looking it up.
Compare that to the 100 or so P-47Ms, 100 (or was it 200?) F4U-1Cs, 250ish C.205s, about 45 Ta152s, about 50 Ostwinds, less than 100 Wirbelwinds and less than 50 B.239s. The Seafire Mk II and Me163, per the not entirely reliable wikipedia, would also be a bit lower production as 372 and 370 were built respectively.
As you can see, the N1K2-J does not exactly stand out for limited production in AH. For some reason people single out the N1K2-J as being egregious for low production numbers.
Edit: You bolded the 393 by Kawanishi, but if you added the other production listed for the N1K2-Ja per your data the total is 415.