Looking forward to trying these packages!
I also agree with @alaskalinuxuser’s assessment. Plus there is a clear record
here of in depth due diligence, and that matters in copyright cases, and with
contract law (licenses are contracts). It is clear you are trying to do the
right thing.
The http://go/ link is an internal Google thing. On their internal networks,
they have set up the domain name go for their employees. So
http://go/android-license-faq is an internal FAQ.