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I don’t think this is a fair comparison. We do not define a universe as being 4d space-time continuum. We may default a universe to that, but it's not a strict definition.We can technically do this with any word if we just apply a bit of Socratic Questioning. The way for the approach in the tiering system is less to use the words and see them being used elsewhere and more about looking at the meaning we give in the tiering system and see if it applies to a certain work.
Like, we define the Universe as a 4-dimensional space-time continuum, but universes can be far greater than that and it's very common that people will misunderstand how this really works. Just a few weeks ago we had someone asking how a 5-D or higher universe could be Tier 1 when Tier 1 is for "multiverse". In the end, how we call stuff here does not matter, the meaning we give to those words are the things that matter. So if a work uses fiction to define the physical objects in the same space-time order, but are somehow limited, it'll not be strange to not accept any more than how we won't say a 11-D universe isn't Tier 1 because it's called a "universe".
Also colloquially, a universe is described as "The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy." This definition fits all of your examples whether the universe is a 4D, 5D, 11D etc.
The reason I invoked the True Scotsman Fallacy, is because we aren't using the colloquial definition of fiction. And now we are claiming that things that are called fiction aren't "true fiction". All those universes you described have quantifiable differences and can fit in the common definition of a universe.
This thing about, "true fiction" does not fit in the common definition and there is no quantifiable difference between what we would call not true fiction and what's called true fiction.