Assumptions based on assumptions, layered with assumptions and topped off with lots of assumptions. No one ever mentions that one reason why the early bones are found in Africa could be because there has never been any civilization to dig them up and discard them for agriculture or city building.
Most of these old bones are found in caves, under rock overhangs and other sheltered places that are unsuitable for agriculture or cities. That’s true in Africa and Europe.
Exactly, hypotheses & confirmed theories supported by innumerable data points, but still built on assumptions which cannot be proved and could be false.
In all of this, science does not require belief, but it does need at least a temporary suspension of disbelief.
So read it the same way you would a great work of fiction.
We can still admire what we don't accept as fact.