Well the obvious issue here is...how do they truly know you wrote the code? Its pretty much impossible to source where OS code comes from, and it sure wouldn't be hard to find an obscure OS project and pass off the code as yours, if you were that sort of person.
And this takes me to my 2nd point, and that is they current hiring model totally leads to companies hiring people who are good at interviewing not necessarily people who are good at doing the work required. There is no doubt t that interviewing for a job is a skill that can be learned and improved upon, and lots of crappy programmers have learned to be damn good at being I interviewed.
If a person has a history of giving talks, writing books, or creating content around code they've written there's probably a high likely hood they are capable workers and can code.
And this takes me to my 2nd point, and that is they current hiring model totally leads to companies hiring people who are good at interviewing not necessarily people who are good at doing the work required. There is no doubt t that interviewing for a job is a skill that can be learned and improved upon, and lots of crappy programmers have learned to be damn good at being I interviewed.