Is Newtons theory of gravity true or false? It's neither. For some problems the theory provides a good model that allows us to make good predictions about the world around us. For other problems the theory produces bad predictions. The same is true for nearly every scientific model. There are problems where it's useful to use the model. There are problems where it isn't. There are also factual statements in science. Claiming that true and false are the only possible adjectives to describe them is also highly problematic. Instead of true and false, likely and unlikely are much better words. In hard science most scientific conclusions come with p values. The author doesn't try to declare them true or false but declares them to be very likely. It's also interesting that the person who made this claim isn't working in the hard sciences. He seems to be a evolutionary psychologist based in the London School of Economics. In the Wikipedia article that desribes him he's quoted as suggesting that the US should have retaliated 9/11 with nuclear bombs. That a non-scientific racist position. He published some material that's widely considered as racist in Psychology Today. I don't see why "racist" is no valid word to describe his conclusions.

This seems to imply that science is somehow free from motivated cognition — people looking for evidence to support their biases. Since other fields of human reason are not, it would be astonishing if science were. (Bear in mind, I use "science" mostly as the name of a social institution — the scientific community, replete with journals, grants and funding sources, tenure, and all — and not as a name for an idealized form of pure knowledge-seeking.)