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Watch Sp02 detection is usually at rather long intervals to conserve battery and typically have not resulted in any sort of detection of low 02 (in my experience, I have very bad sleep apnea)compared to a pretty dependable and accurate $30 on the finger oximeter.

The watch can ramp the detection up for periods of time if it chooses, such as when doing a workout. But also, people with sleep apnoea tend to have their O2 trend low not just go briefly low.

I think the pulse oximeter would be most helpful in concert with the accelerometer, as described in the article.