I wouldn't say leucistic at all.
Does he have a kind of shiny ring around his eye? If so, my guess is wild type. If not, I'm guessing a lighter melanoid. Correct me if I'm wrong (I'm still an amateur with axolotl colorations and genetics), but I'm fairly sure melanoids lack the "shiny" iridophores that a wild type axolotl would have.
Either way, he's gorgeous. Let me know if he ever contributes to making babies
Edited because I forgot how to spell.