Huh? What are you talking about? Anthropologists use both DNA and "bones." Comparing the presence of random mitochondrial mutations in human and chimpanzee mt-DNA for example yields a date for a common ancestor that's remarkably close to what fossils alone indicate.
Looking at DNA from extinct species is more difficult, because it tends to decompose rapidly. However, some Neanderthal DNA does exist, and there are a great many researchers studying it at the present time.
My comment was regarding this particular article - no mention of DNA at all. For completeness, one would think at least some passing reference to ongoing DNA analysis would be made.