Portillo writes:
Anatomist Rudolf Virchow said that neanderthal were human in every respect, some appearing to be suffering from rickets or arthritis.
Rickets and arthritis are not evidence of being human.
Kittens can get rickets; dogs can get arthritis.
Also, Rudolf Virchow died in 1902. He was not (for example) able to do a genetic comparison.
He also thought that the flattened skull was due to a powerful blow to the head.
It seems that most of his theories about neanderthals have been disproved by further discoveries.
Portillo writes:
Paleoanthropologist Erik Trinkaus said "Detailed comparisons of Neandertal skeletal remains with those of modern humans have shown that there is nothing in neanderthal anatomy that conclusively indicates locomotor, manipulative, intellectual or linguistic abilities inferior to those of modern humans."
Erik Trinkaus also thinks that neanderthals are not human.
So, despite your quote suggesting that neanderthals are fully human, the person you quoted does not think they are.