Tidal Connect lets you connect to the streamer from the Tidal app. You then won’t need the Naim app, which you need now to enter your credentials and then select and play Tidal tracks from the Naim app.
100%, probably. Unless Tidal has done something in their connect software which differs from retrieving it from their API layer. But if I would have to guess, I’d guess that the Tidal connect software in the streamer utilises the same API to retrieve the data from their servers en doesn’t have some form of DSP build in.