This point looks wrong to me. Lagar Velho Child for one controversial data point, various Skuhl specimens for others that come to mind at once.
European Neanderthals seem to be the most extremely divergent from us, espically in the West. In the Near East especially, there are more ambiguous and intergrading specimens. The story there is complicated. Note the caption to the Skuhl 5 specimen on that page.
I do recognize that the Lagar Velho child is the subject of acrimonious debate. I don't really want to engage that acrimonious debate except to say that thus far I find the anti-hybrid arguments more persuasive. I have linked the primary argument in post #211 above.
And beyond that, I want to emphasize that what I am listing in post #175 are all the factors that in my view would ordinarily lead to a clear designation of Neanderthals as a distinct species (if they were just discovered today).
But as has been pointed out over and over (usually in dispute of my position!), distinct, but closely related, species can nonetheless in certain cases produce hybrids.