Not sure about the app, but the Bluesound Network Player devices support Deezer HiFi:

https://www.deezer.com/devices/soundsystems

Yes the bluesound app itself supports Deezer, but it has very limited functionality. That’s why I look for the Deezer app to be able to stream directly to the node 2. This doesn’t work to my knowledge I was hoping for someone to tell me how it does work. I fear going back to Tidal is my best option

I find the Bluesound app works very well for me, with a few features missing but generally very functional. Seems I have to give it a few moments sometimes to fully load. When I want “full Deezer” I Airplay to my Node.

I’ve decided to leave the sound quality of Deezer HiFi doesn’t compare to Tidal and the app not functioning are critical to me. Maybe in the future when these issues are solved….