And you're still misapplying it. Because a class being playable is
not a lore thing. Unless you could show me the lore in which Anduin, or Varian, or Bolvar, or Lady Katrana Prestor ever signing something, or proclaiming "now the players can choose monk as their class!" or something to that effect. Which you can't, because that's not how it works. A class being playable is not a lore thing. It's a
game mechanic thing. Which is why pointing at NPCs that resemble currently not playable class concepts does not work.