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 and TIDAL's StreamMagic app integration.
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, and you will need to be running StreamMagic app version 2.14.1 or later to stream Hi-Res FLAC files via TIDAL's StreamMagic app integration.