1. Made optimistic claims about future product.
2. Some of the people tasked with implementation disagreed about optimistic claim.
3. Those people got fired for underperforming.
4. All people on the team tasked with implementation agree with optimistic claim.
5. Doubled down on the promise.
Repeat every year.
I can't see how a CEO could be blamed in this scenario, as clearly they were lied to by their subordinates.