What do you mean by this specifically? What claims does he make? It's hard to respond to this just based on what you wrote. I don't think biologists have claime

What do you mean by this specifically? What claims does he make? It's hard to respond to this just based on what you wrote. I don't think biologists have claimed that biology isn't complicated, and I don't think anyone claims that DNA isn't complicated either. Unless you are referring to genetics? That is still caused by DNA, just not by gene expression.