Here is a research article posted by a respected ER doc frined of mine. Says much the same thing but not in lay-language. It is from Chinese researchers, to be clear, but it matches the clinical data. https://chemrxiv.org/articles/COVID-19_Disease_ORF8_and_Surface_Glycoprotein_Inhibit_Heme_Metabolism_by_Binding_to_Porphyrin/11938173?fbclid=IwAR2J76X9gPfZCp8ahTnQI5bRsZdqhp53OSgDaFfiT6YlW8JHm-dtaETVcak 

And this AI tool fed back similar markers for severe disease:

"The [AI] tool discovered several surprising indicators that were most strongly predictive of who went on to develop so-called acute respiratory disease syndrome...changes in three features — levels of the liver enzyme alanine aminotransferase (ALT), reported body aches, and hemoglobin levels –- were most accurately predictive of subsequent, severe disease...with up to 80% accuracy."

"By contrast, characteristics that were considered to be hallmarks of COVID-19, like a particular pattern in lung images called "ground glass opacity," fever, and strong immune responses, were not useful in predicting which of the patients with initially mild symptoms would get ARDS.