The DLNA interface does not compress the data. What you send is what you get. With Bluetooth and Airplay2 it's another story. Here's a note from Qobuz on the issue:'
We remind you that a Studio Premier or Studio Sublime subscription is required to enjoy this streaming quality, and that the Hi-Res option must be selected in the settings of your Qobuz application...
help.qobuz.com
"Listening through your phone, via a wireless device
First of all, please note that Bluetooth is unfortunately not a viable option, as the files are compressed before being read by your Bluetooth device, negating the value of Hi-Res quality.
The Airplay function on iOS only allows Qobuz to be used in CD quality due to Airplay’s restriction to 16-bit digital audio files at 48 kHz.
Among the reliable solutions, you can use: Google Cast / Chromecast built-in
On iOS (as on Android), the Qobuz app is compatible with Google cast/Chromecast built-in, i.e. you can stream Qobuz in Hi-Res to devices compatible with this service (in 24-bit at 96 kHz in most cases and up to 24-bit at 192 kHz on some devices).
It’s both a simple and universal solution, offering a very good sound quality due to it being in FLAC format. It also has the advantage of not draining your battery, as your smartphone acts as a remote control, with the files being played directly from the Qobuz servers by your Google Cast/Chromecast built-in device."
Audirvana uses DLNA to maintain the integrity of Hi-Res files as well. The other method you could use is an external DAC but I prefer the flexibility of Audirvana.