This is a CEO of a company that wants to get a product out the door. Sometimes that's not easy. He's basically using the tools at his disposal. It sounds like he's given his team a year, and they still haven't delivered. An email like this can sometimes shake out the non-performing team members and lead them to quit. In a company with 7,600 employees - I'm pretty sure not every one is a star performer.

Anyways, I've worked for a CTO who basically was a raving lunatic. Every couple of months there would be some kind of a blow up. But, looking back, we also did some amazing work under him, and created a cutting edge service still used 6 years later.