And why are you bothering comparing WoW to the RPG if you aren't going to read what is actually in the RPG? I literally sourced you, told you the page to look up, and you couldn't even bother looking it up.
I mean the list of core classes in the WoW RPG are Arcanist, Barbarian, Healer, Paladin, Rogue, Scout, Tinker, and Warrior. Isn't that enough to show you how different it is to WoW? Even in the Arcanist section alone, it talks about Multiclassing Necromancer/Warlocks as a viable class option. WoW doesn't allow that at all. There's huge differences here.