Roon Tested is described here: https://kb.roonlabs.com/Roon_partner_programs
Roon Tested will not give you network access to the Oppo. You can see what the story with the Oppo tested devices here: https://kb.roonlabs.com/Partner_Devices_Matrix
It looks like we have have BDP-105, and it does indeed work via USB.
As for becoming Roon Ready (getting RAAT capable), that is in their hands.