Because he’s primarily 11.1 content, not really relevant (though present) in 11.0.
The developer’s notes on what Blizzard intended for Undermine in vanilla should indicate it.Link #1: no real indication of undermine's actual size in the lore.
Link #2: an opinion piece, fan interpretation.
Link #3: the RPG books are not sources of lore. Also, since it's topical: according to that same book, Azjol-Nerub has a population 20.000 (same as undermine) and yet it was the smallest dungeon in the Wrath of the Lich King expansion.
Are you being purposely obtuse? You know large parts of Azjol-Nerub got cut because they couldn’t get it done in time for release (because it was going to be a ton of work).
The idea that Blizzard wouldn’t refer to vanilla development notes and RPG lore is nonsense.
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Ancient Spider-city filled with monsterbugs =\= Industrialized, multinational Goblin city with trains, Zepplins, trade organizations, etc.
Not the same thing.