You don't get more oxygen by breathing more. When you breath more the CO2 is expelled from your blood and hemoglobin cannot efficiently collect and transmit O2 in the absence of some specific amount of CO2. In fact most people overbreathe, and they should be breathing less to be optimally oxygenized.
The book Breath: The New Science of a Lost Art details the journey of James Nestor as he goes over all these different methods and exercises, it's the #1 book I recommend to everyone. The number one certain conclusion to take home from the book that'll literally extend your lifespan significantly: Don't mouthbreathe, never ever.
While Bohr effect is a real thing obviously, your description doesn't seem to be fully correct (though it's not my field of expertise). Haemoglobin will link with O₂ just fine when level of CO₂ is decreased, only release of it in tissues will be negatively affected. But it's not like it stops at all, and to me it's not clear if it can really lead to a full-scale oxygen deprivation. Blood low acidity resulting from low CO₂ can explain symptoms like involuntary muscle contractions described by that poster above on its own
How long before this become a TIL on Reddit? I'm guessing it's already in the que. Then it will slowly make it's way to different sites with titles like 'This one thing is ruining you energy level'...'5 quick hacks to increase your oxygen levels, you will never guess what number 5 is'...
Aerbil313 putting in the hard work to keep the content wheels of society turning!
But I do love seeing these 'echos' bounce from discussions like this off into public consciousness then into the randomest places.
See https://pubmed.ncbi.nlm.nih.gov/30252284/
The book Breath: The New Science of a Lost Art details the journey of James Nestor as he goes over all these different methods and exercises, it's the #1 book I recommend to everyone. The number one certain conclusion to take home from the book that'll literally extend your lifespan significantly: Don't mouthbreathe, never ever.