What aspects of their published paper (not the web press release) drive you to this conclusion?
If is more often the case that the scientists have their theories correct, but the general public misunderstands or is misled by the media reports.
Human DNA can respond to and provide a large variety of adaptations for the living environment.
One must understand that the word ‘species’ is based on ‘adaptation to environment’.
Why should we even doubt that there are , and have been , a large ‘variety’ of ‘humans’?