It is just a fact that there are multiple definitions of human. I use “biological humans” to refer to some version of a scientific definition, and “textual human” to refer to the traditional/Scriptural definition: AE and their descendents.
They are biological humans, but not textual humans. From a theological point of view, they are not the topic of Scripture or of traditional theology. They fully “human” people who were outside our view.
So textual humans are interbreeding with non-textual humans.
I gave 5 possible options, and explored their strengths and weaknesses in Ch. 7. Eve was considered alongside Adam.
One thing I notice is that you have a strong aversion to miracles in human origins. That aversion isn’t required by science. What we oppose is incoherent or unstated miracles.