yes: this was supposed to be the cause of the high mortality, along with secondary bacterial pneumonia.
The Teaching company has 3 lectures on the Spanish Flu on line at Youtube
also they have put their entire infectious disease lectures there.
https://www.youtube.com/watch?v=AF8RrjbLFUo
You might find this interesting:
Out of 7 NYC critically ill patients, 2 were taken off vent and 2 others significantly improved.
The drug is called Leronlimab by CytoDyn. “Leronlimab is believed to provide therapeutic benefit by enhancing the immune response while mitigating the “cytokine storm” that leads to morbidity and mortality in these patients.” There’s that cytokine storm business again.