Yeah they have been fucking the lore badly for a while, cata being the worst of all to it but the giants at draenor are indeed mentioned at warcraft II. I have the manual from back then and it states the temple of the damned were made from giant bones from draenor, althought it does not explain what kind of giants they were and by the look of their bones at war II they were like super sized humans not the giants we see in game most of the time. Probably they had their own giant race there.