I'm imagining some engineering teem at Apple telling their bosses "yeah, it's almost ready" and the bosses believing them without really caring, because it's just a silly accessory and no big deal, right? And then since the AirPods 2 announcemen, the internet has been rabid with anticipation for AirPower. announcing it is cancelled is a better PR move than letting that internet fanboy frenzy turn into frustration with delays.
I wouldn't be surprised if we see AirPower turn up again in a years time.