Take their readings with a serious grain of salt. Even with the admonition "not as accurate as fingertip". Their readings are garbage. A random number generator does a better job of reading my SpO2. And I'm particularly pale. It's even worse on people with dark skin.

I see absolutely no benefit in the pulox feature on my garmin watch.

Mine usually reads about 97%, which is probably close to right. But I haven't been able to test it at high altitude yet.