Hifi on chromecast

Hello,

I have two questions:
- I see everywhere on the internet that Deezer now streams hifi to many other sound systems than just Sonos, but here in FAQ says that it isn't true??
- I have Sony MHC v77dw powerful system with built-in chromecast but when I'm casting music from my Galaxy S8 (from Deezer app) I don't see HQ sign unlike when I'm listening directly from my mobile and headphones?

Thank you for your answer,
Sincerely