Hmm, good catch! Yes, that's an error. They should take Craft Amulets, but that wouldn't be their Hermetic Virtue. I might suggest something like Puissant Vim, or maybe Special Circumstances (amulets). I think Holy Magic can be their Major Supernatural Virtue, still. Hermetic as a Virtue or Flaw Type is kind of misleading, because according to Hedge Magic it actually means that the character must have The Gift to take them, not that only magi can take them.