This is the translation from the official Xiaomi website:
"Headset Compatibility Description: Support Millet 5, millet 5S, millet 5S Plus, millet mix, millet note2, millet 6;
If some of the features are not available, it is recommended that the mobile phone update to MIUI the latest development version, MIUI stable version will continue to update
Millet 4 C, millet 4S music and noise reduction function support, call and keys do not support;
Millet 5 C, red Rice Pro Incompatible
Other Type C interface handset, because the chip platform and the handset interface definition is different, some handset supports the noise reduction and the music function, the call and the key function does not support."
So I suppose it should work, except perhaps the keys.
ok, i ordered the Xiaomi ANC headphones and gave it a try. Although not supported, it works fine.
Remote Control Buttons work and also noise cancellation. The only Thing that does work is the MIUI Sound enhancer / Equalizer.
Reason is, that this Feature works only with 3,5mm headphones, not USB ones with external DAC.