Was Dweomercore created for Waterdeep: Dungeon of the Mad Mage?

Did Dweomercore, Halaster’s magic academy in Undermountain, exist in any published Forgotten Realms lore prior to Waterdeep: Dungeon of the Mad Mage? If so, where? Or was Dweomercore created for Waterdeep: Dungeon of the Mad Mage?

A web search doesn’t turn up much, but here is one online post that states, "In older lore, I recall Trobriand actually set up Dweomercore…"