Hypoxia caused by insufficient oxygen in the air produces euphoria, then you black out. Pilot training includes learning to recognise the early signs of hypoxia in a hypobaric chamber. The delivery of oxygen deficit is via breathing. Pilots are rigorously taught to recognise the signs. Blue fingertips is a biggie, especially if you are flying above 14,000 ft and you start feeling inanely happy.
What PN refers to as "hypoxia" when he is taking about the mechanism of death by SN is nothing like altitude hypoxia. It is lack of oxygen due to the red blood cells' reduced capacity to carry oxygen because they have been "hijacked" by the sodium. This process, and the symptoms prior to death, are
nothing like altitude euphoria. The experience as organs shut down is documented in many scholastic articles, and it's not pleasant at all.
If PN hadn't already been "encouraged" to surrender his medical license, he would have lost it for the ignorant and misleading comparison. He claims death by SN is euphoric. It is not. Suggesting it is by reference to altitude euphoric hypoxia is bordering on criminal misrepresentation.
Caution. Remember that PN is NOT a registered medical practitioner. He is selling death via the fully commercial PPeH. I am waiting for his next announcement:
"Shares in the Brooklyn Bridge now available! Full jumping rights guaranteed! Register early for free bonus propeller cap to make your fall Insta-worthy!"
Or, other random shit.