If the Roon Signal path is showing that the stream is MQA, then it’s MQA. This has nothing to do with Roon integration, because Roon does not choose the stream; it only plays back what TIDAL provides; and TIDAL is still serving up MQA.
Note: although TIDAL has removed MQA indicators and decoding from its own apps, as I understand it, if you were to playback the same track (using a bit-perfect configuration) through an MQA DAC, you would similarly get an MQA stream and decode.