Why has Tidal playing an MQA track, but Volumio shows 44.1kHz 16bit resolution?

Volumio plays the track as it is and does not unfold.

The MQA stream is forwarded to the DAC unmodified.

When the DAC supports MQA, then it will do the unfold and plays MQA.

The final unfolded resolution of the MQA stream will be displayed on the DAC display.