I have some beef to pick with the article:
1. It alleges that CMM5 organizations have about 1 defect/KLOC. Having worked and knowing such organizations, I can anecdotally confirm numbers like these are fiction. CMM5 certification has more to do with greasing palms rather than any absolute defect measurement.
2. A defect rate of 0.04bugs/KLOC is not zero bugs/KLOC. The difference is infinite in magnitude if that single bug is -- kills the user.
3. Low defect rates are more often a product of poor testing, not superior development.