That's true in some cases, but very false in others. CS is not just about math, in fact, I have done almost no complex math since I left college and started my career like 7 years ago. CS to me has been more about critical problem solving, high impact design, and making sure you don't cause more work with the work you do. I work on a highly parallel data warehouse that uses both hardware and azure vm services and while I need almost no math, there is an incredible amount of research and thinking that go into it. This is one area where experience is quite important, but fancy algorithms are almost entirely useless.