Would technologically advanced intelligent beings from another universe who created our universe and designed life as we know it by utilising the natural laws of their own universe qualify as "God" as far as you are concerned...?
Would they qualify as "supernatural".....?
If the inhabitants of a different universe with different physical laws could apply their laws in our universe, that would be "super".
But the laws of our universe would be a direct consequence of the laws in the multiverse and the types of universe that can arise in it.
If the laws of our universe were a subset of the multiversal laws, then the multiversal laws that do not apply to our universe would be "super" or "extra". It might be possible for some entity to use those multiuniversal laws in our universe.
However, if the laws of another universe were just different from ours with no overlap, it seems unlikely that an entity from that universe could use them in our universe.
So if an entity exists which is unbounded by any such laws, an entity which is able to do things which breach the physical laws of the multiverse - Is that supernatural too?
That's what I would call "supernatural".
In a multiverse situation, I think the most likely situation would be that an entity could use the natural laws only in and of his own unverse (like we can). There is a possibility of overlap of those laws between universes - e.g. an entity from another unierse might be visible in ours.
Less likely is an entity that could use his laws in our universe to do things that are "impossible" in our universe - e.g. make massive objects repel instead of attract each other.
Least likely is a "super" entity that could manipulate every universe in that way.
(Mind you, I'm looking at this from a science fiction viewpoint and I have no idea of the mathematics involved.)
I look at the science with my pre-existing theistic beliefs, so when I look at the science I start with the assumption that God did it.
You believe that your car was created by the great Ford in the sky (under the sign of the big T). Your study of how the car works (somehow) confirms this belief. Even a visit to the factory (somehow) confirms your belief.