I'm not quite sure of his first argument. He seems to be saying that species categorization by morphology is flawed because they only differ by shape.
That's like saying the rainbow is all the same color because it only varies by wavelength.
Of course color categorization is going to have arbitrary boundries -- wavelengths vary contiuously. But we know red is sufficiently different from blue to name them. Same ways with fossil bones.
His second argument that there are examples of 6000 year old H. erectus is a factual claim for which he provides no evidence.
That statement is in accord with the position that NOTHING is more than 6000 years old.