I've played since early vanila but I don't remember dwarfs being mages. They were priests but mages you had only gnomes and humans on alliance and undead and trolls for horde.

I may be wrong as it was a lifetime ago.

According to AI:

Although Dwarf Mages were present in the beta and even listed in the original Vanilla WoW game manual, they were removed before the official launch

I've played since early vanila but I don't remember dwarfs being mages. They were priests but mages you had only gnomes and humans on alliance and undead and trolls for horde. Orcs, Taurens

I may be wrong as it was a lifetime ago.

According to AI:

Although Dwarf Mages were present in the beta and even listed in the original Vanilla WoW game manual, they were removed before the official launch