A big, and little-discussed, problem across many industries is that there is no "pipeline" inside any company. Since the 1980's, the idea that you develop your own talent has fallen by the wayside. You hire it from other companies. Inside software, the issue may be bigger, but it exists in many others as well.
Does AWS intend to have that pipeline within the company, starting with juniors, like this talk implies?
They don't, that's why their CEO needs everyone else to believe they need to keep on hiring juniors aggressively so AWS can poach them a couple years down the line if needed