I doubt that is a real Google-issued certificate authority based on the issuing CA certificate having an e-mail address identified as "nbbsw@nbbsw.com". It's likely the reason this sample was removed from the post?
Same thought here. The domain appears to be associated with Ningbo Sunning Software, a Chinese vendor and likely a Mediatek partner than anything Android.
Good catch after looking into it more this may be related to subcontractors providing vendors with malicious update tools that they then sign.