"Ford rehires 350 engineers after AI fails to preserve expertise or train juniors" In order to rehire someone they must laid off or fired? You don't rehire new employees?

Farther down it clarifies that only some of them were former employees, and others were poached from other companies:

>Over the last three years, Ford says it has hired 350 veteran engineers, many of them former employees and others from suppliers

And not all former employees were laid off. Senior 'greybeards' have many job opportunities elsewhere and often leave for better offers.