See my post from yesterday- it is the same recommendation that you received from Oppo. I haven’t used Tidal on an Oppo in some time and remember it becoming more clunky as Tidal’s services changed (Oppo app never changed with it).
If you’re seeing a difference in sound quality (using the Oppo as a renderer) it would be based on your local network. Wi-Fi should work well but if spotty try running CAT from your router/mesh/extender directly to the Oppo itself.