I'm not dumping on this article, nor am I attacking the poster, but in reading the article, I found a few uses of "odd" terminology. It reads like someone with some understanding of A&P (anatomy and physiology) is trying to tie together a few facts to make an argument.
Now, I have to admit that the more we know about medicine, the more we realize how much we DON'T know.
Somewhat supporting of this article, and just as a background about how there is a wide world of variability:
https://www.ncbi.nlm.nih.gov/books/NBK54103/
"There are at least six genes that control globin synthesis in humans, resulting in the formation of six structurally different polypeptide chains that are designated α, β, γ, δ, ξ, and ς chains. All normal and most abnormal hemoglobin molecules are tetramers consisting of two different pairs of polypeptide chains, each chain forming a monomeric subunit.
The blood of a normal adult human contains at least six different species of hemoglobin molecules, all of which have the same principal structure and function. Hemoglobin A (A for adult) makes up 92% of the total hemoglobin concentration in a normal adult human. To date, approximately 200 structurally different human hemoglobin variants have been reported. These abnormal hemoglobins (relative to hemoglobin A) often have different oxygen-binding properties."
In short, there're a lot of variables between people, beyond the obvious "co-morbidities".
I read the article with hopes. When it started in on politics, my hopes were dashed.