No human alive today descended from any species of chimp, bonobo, gorilla, orang, or gibbon that currently exists.
Huh???
Of course! That's how science works. You take a set of observations, propose explanations, and invite attack by as many others in the field as you can entice to comment.
That's the whole point of science -- developing then trying to disprove hypotheses. Scientific testing is the attempt to disprove a hypotheses. Scientists always dispute each other's ideas, even when they believe they're correct.
The basic mechanisms of evolution are not in dispute. They're universally accepted; having withstood every attempt to disprove them over the past century and a half, while amassing voluminous supporting evidence.
People with degrees, attempting to validate pre-conceived, religious doctrine, are not what I'd call scientists.