Lyxen
Great Old One
If everything the DM rules or changes is RAW, then RAW ceases to have any meaning.
Which is good in general, because RAW should not matter in a game, but in this case it is even more pointless, as the basis for the discussion is not even rules, it's just a sidebar that tells how divinities are often arrayed in a given world. There is nothing prescriptive there, and nothing that can be construed as rules affecting play, just guidelines about world design. Especially since published words from previous editions have their own history and no reason whatsoever to abide by new guidelines.