other way around - reduced air pressure is reduced oxygen, which is lower metabolism. Higher metabolism causes EtOH degradation to go more quickly. Fever is higher metabolism.
Your blood oxygenation will stay at 95-99% even while in a cabin.
Metabolism in aircraft is pretty low: you’re generally sitting idle, but I think the alcohol metabolism is still constant except the terminal metabolism.
Fever is partly metabolism, but largely reduced cooling.
I've taken an oximeter with me on flights before, and can give a data point of n=1 to say this isn't the case.
My oxygen % decreased initially with altitude until it stabilised around 90-92% (at ~10k feet, IIRC). It sat at this point for the whole flight (8 hours), with a low of 87%.
Through forced rapid deep breaths I could get it back up into the mid-high 90s, but also got light headed and funny looks.
Metabolism in aircraft is pretty low: you’re generally sitting idle, but I think the alcohol metabolism is still constant except the terminal metabolism.
Fever is partly metabolism, but largely reduced cooling.