Only the insane and the ignorant are ever certain of anything.
It is tedious to keep reading quotes from these "scientists" without a life who claim "proof" of the unproveable every few months.
First of all the basic question can never and will never be proven.
Events of 1 or 2 million years ago simply have not left enough evidence evenly distributed across the world and accessible uniformly. That's just the nature of the problem.
The pathological "P.C." obsession with "proving" Africa is the origin of everything (a setup for "reparations"? LOL) is getting very tired. That horse is mush already...
If we originated from a single source or several, or from Antarctica or Cucamonga... is irrelevant.
Let's just continue to gather knowledge for academics' sake and get rid of the "proves" obsession.
This "proves" nothing. It is an interesting brick in the wall of knowledge; nothing more and nothing less.