I agree with you that using these terms (“true humans” or “real humans,” or “spiritual humans,”) does not help to better understanding the “biblical revelation” in Genesis.
As a matter of fact, in Genesis 9:3, 5-6, God establishes the universal prohibition of homicide by declaring that:
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Each human being is accountable toward God and toward humankind for killing another human being.
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Humans are allowed to use animals for food, and so are animals not accountable for killing each other.
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The reason for this principle (foundation of morality and law) is that God made humankind in the image of God.
I take for granted that you agree with me that this is “revelation”, not “speculation”.
Here revelation clearly draws a line between humans (beings who are accountable for killing each other because they are made in the image of God) and animals (creatures that are not accountable for killing each other, and can be used by humans for food).
You can use the word ‘human’ to refer to such “early humans” and “modern humans”, but (as you rightly acknowledge) you are NOT using the word ‘human’ in the sense that such “humans” are morally accountable to God for killing each other, i.e., you are NOT using ‘human’ the sense this word has in the revelation of Genesis.
If those “early humans” and “modern humans” you refer to, “were not morally accountable to God” for killing each other (as you assume), then they are like the creatures referred to as “everything that lives and moves about” and “animals” in Genesis 9:3, 5-6.
So you yourself are apparently “drawing lines”!