Unless it was a magnificent transition/no-load-loading-point, it's definitely just an interior, like the Hispania.
it isnt an interior, the inside of the nomad lair in the unknown system isnt even large enough to fit what you saw in singleplayer.
That, and I'm fairly sure the interior of the lair is listed as another system in the game files. Technically, you dont have to go through a long jumphole/loading screen to move from one system to another, ask the admins with their teleporting abilities =P
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