Is it a coincidence that multiple OEMs are now activating the Sp02 sensors in their smartwatches via an update? After Huawei did so with the Watch GT 2, Honor has now rolled out an equivalent firmware update for the MagicWatch 2 that enables blood oxygen saturation monitoring.
https://www.notebookcheck.net/The-MagicWatch-2-supports-blood-oxygen-saturation-monitoring-too-it-s-just-that-Honor-left-its-Sp02-sensor-disabled-for-six-months.464338.0.html