That's not true at all. The company fires people all the time because their skills just aren't necessary. I mean I guess technically it's a layoff, but a layoff and getting fired are functionally the same at Netflix as they both come with the same severance.
When we moved to AWS, there were plenty of folks who were let go because their expertise was in physical infrastructure and they had no desire to learn about the cloud.
They were stellar performers, their expertise just wasn't needed anymore.
I very much enjoyed working in a culture where both hiring and firing were easy to do, to make sure that the team was always the right people at the right time.