It's just bad writing to mash up these places and claim ties to Atlantis, each should be their own separate thing, Atlantis shouldn't have ties to anything and honestly I feel like the only person who even cared to do some world building into the pre cataclysm history was J.M. DeMatteis for the issues with Namor and Man-Thing. Anything else I disregard because Atlantis was just used for other characters and not Namor, like Avalon was Atlantis? Attilan was Atlantis? makes no sense and feels like a lazy mash up to justify them using Atlantis for their plot, it never added anything to Sub-Mariner lore, and I don't like there being any ties to Inhumans.