What Would You Call This?
Let's say you write a novel or story set in a world that that neither contains a large amount of futuristic technology or apparent magic and it's not a parallel universe and it's on another planet in another universe what would you call it? Science fiction? Fantasy? How would you describe it?
If it has to be Fantasy or Sci-Fi
I would go with fantasy, unless you have a history of humanity that tracks back to us here and now. It doesn't have to be explained or known to the characters (a la Foundation), but if your idea is that, in the far future, humans (the ones that evolved on Earth) eventually come to live on that planet, then it sounds like sci-fi.
If, however, you are talking about another world that also has humans, that sounds like fantasy in the same way that ASOIAF is Fantasy. Even if they had a futuristic laser gun, it is a world that isn't Earth and the characters are not distant descendants of Earthlings, even though they are human.
It sounds to me like you want to tell a regular story about regular people, but you want to world-build without the constraints of our real governments, histories, and biases.