I've looked way too much into axolotls for the day...I think that banning albino axolotls might cause issues - the vast, vast majority of axolotls in UK zoological collections are albino (or occur in mixed groups of albino and wild-type) and there isn't really any concrete record of which collections hold solely wild-type.... so ruling them out would a) mean that getting that species becomes a "lucky draw" of sorts and b) potentially require people to provide proof that the collection they visited does hold wild-type (which would break rule 2).
Given the fact that all axolotls in captivity (including wild-type) contain *some* hybrid blood way-back-when in any case, one possible way to resolve this issue if you definitely don't want to include any albino axolotls would be to ban axolotls entirely under rule 9.
Though I do find it interesting how humanity manufactured the 'neo-axolotl' largely from the axolotl, but also from the other North American salamanders. And with less than 1000 of the 'original form' remaining... but the neo-axolotl sees immense success in the laboratory and as a household pet.
Looking at older illustrations of the axolotl - my guess for what the original phenotype looked like was that it was muddy-brown with spotting; but with pink frills as well.

And some captive axolotls display such a phenotype; to varying degree.


Though of course this is rather variable
