I need to point out that it has been some time since I have reviewed information on periods of time that can be equated with records of human activity, so I hope you can accept the approximations inherent in my response. The earliest “records” as I recall are of Australian aborigines who constructed a cave that the press reported as the earliest ‘Stonehenge’ in its construction and size and features, and this was dated at about 30,000 years. I recall mounds and caves that in various parts of Europe that may also be dated in the thousand to ten-thousand years ago. The mountains of evidence refers to more recent times, and this data has been used in a paper that models the current population commencing from a couple at about 10,000 yrs ago. If you do not have a copy, I can try and find it for you. Thus my time frame is approximate, but it is in the thousands and not the 10-100million time frame.
I would endorse a view that accepts Adam and Eve as a distinct couple endowed by God with free will and who communed directly with God. I would also accept as an aside that other biological humans could have existed at that time - however I elaborate on this by discussing God’s law, and the importance of Adam and Eve as a creative act that impacted on all of the Creation, including other biological humans. Obviously that needs considerable discussion and I cannot get into that now.
Within this brief comment, I accept the view that all of humanity are descendent from Adam and Eve (as the stochastic model shows) but biologically/genetically the human race contains biological material from other humans - this would be qualified by the term “true humans” which would be derived through Adam and Eve.
I trust that makes my point a little clear, although I think my points may raise more questions than answers on this site.