So do I. And Fichori is right. DNA is like code and the cell is like a computer in that the code is interpreted and logical decisions are made to produce results. He did not say "the same as".
DNA is more like variable parameters to a function than machine code instructions. When you alter the input to a function you alter the output, but you do not crash the system. Cells can metabolize for some time without DNA.
DNA as code is a very limited analogy, and cannot be used to imply that mutations are typically fatal.