Yes, as long as you have the required TIDAL subscription, you will be able to stream TIDAL's Hi-Res FLAC files at their highest resolution on the 851N via TIDAL Connect.
Please note you will need to ensure that your unit is running Service Pack version 022-a-147 or later to enable TIDAL Hi-Res FLAC compatibility.
TIDAL's StreamMagic app integration doesn't yet support Hi-Res FLAC playback, however our software team are currently working on this implementation which will be added in the near future.