Whilst I agree, I think people are often trying to express some nuance when they say stuff like that. The typical situation being someone who doesn't actually log huge hours in-game, but spend a lot of time working on theories, reading up/discussing bosses/approaches, sim'ing their character, working out how to min-max them completely and so on. Their total hours spent on "how to progress in WoW" may be pretty high, even if their in-game hours are low. Personally I don't find that very fun, but it has been a thing.