IBM ostensibly failing with Watson (before Krishna was CEO for what it's worth) doesn't inherently invalidate his assessment here
What is more convincing is when someone invests heavily (and is involved heavily) and then decides to stop sending good money after bad (in their estimation). Not that they’re automatically right, but is at least pay attention to their rationales. You learn very little about the real world by listening to the most motivated reasoner’s nearly fact-free bloviation.
But Watson doesn't count?
Maybe that will turn out to be a good decision and Microsoft/Google/etc. will be crushed under the weight of hundreds of billions of dollars in write-offs in a few years. But that doesn’t mean they did it intentionally, or for the right reasons.