I don't see how an FCC posting fully undermines an NDA, because an NDA can cover you keeping what you learned, like how well it behaves, between yourself and Anker for the agreed period or until released.
Say this product just tanks (unlikely) like it doesn't work well (lots of reasons like say the Wifi chip isn't working too well with some make of router), you can give that feedback to Anker, they can then tweak the product, get an updated approval as applicable from FCC, and then that tweaked product is released. The (illustrative) example of a product problem is kept under NDA.
Also, FCC is USA, the Roav Dashcam was in FCC months after it was being tested in Asia, only once FCC got us to notice did a trivial search find months old YouTube videos, so this could have been tested in Asia already under NDA and now its getting to a later level of NDA testing.
The Wifi frequencies are different in USA.