I’m adding some points of clarification here since remixing is not mastering and mastering in analogue has nothing to do with MQA. In the Coldplay example it was the artist’s choice to master in analogue (each track was mixed in digital.) In the Madonna example the original mix (analogue tape) was converted to digital for remastering.
The fact that the ADC used a higher sample rate and bit depth to capture the master is not relevant either; the engineers were working with an analogue source. This is very different to, for example, converting a lossy MP3 to a lossless FLAC.
Regarding a 44.1kHz MQA stream unfolding to 88.2kHz, this is explained in the following post.
However, I agree that MQA has failed to deliver on their promise of provenance–a point I made in my opening post.