Apple is the tech marketing messiah, why would they announce AirPower at a major product demo and think that it somehow wouldn't be hyped? This is a really strange fumble for them.
It was also listed as a major feature for the new AirPods, that doesn't seem like something Apple would slap on a box knowing they probably weren't going to ship, especially if was a "silly accessory."
I can totally see an engineering team BSing leadership on the product readiness, but there had to be internal pressure on this. Apple knows this looks bad after investors weren't super impressed with the News+ demo.