If you give me a CMaier X1000 Turbo Max Pro pre-production model for review and I turn it over to Timber Tear It Open for a teardown, you have every right to get all up in my colon and tell me to 1. get your property back and 2. get that teardown off the internet. You didn't give the X1000 TMP to Timber, I did. If I want to keep getting access to your products then I will correct my error because it wasn't my right to give your property to Timber. I want to remain in your good graces and Timber wants to remain in my good graces. The teardown gets torn down.
When you ship the X1000 TMP, Timber purchases one for teardown... as they normally do for all their teardowns... of products on sale... which your X1000 TMP was not.
To answer your AirPower question... ifixit would not be allowed to tear it down and publish unless they got explicit permission from Apple. Otherwise the would be in possession of potentially stolen IP and subject to legal action. AirPower? That legal action would be swift and unrelenting.