There isnt enough supply of plasma, last I read they were in low supply for transfusion and emergency. This seems like he's callin their bluff on the covid.
https://www.theguardian.com/us-news/2020/mar/21/us-blood-donations-shortage-coronavirus
The American Red Cross said that as of 19 March, more than 5,000 of its blood drives were canceled across the US over coronavirus concerns – resulting in approximately 170,000 fewer donations. More than 80% of donated blood collected from the Red Cross is from drives at places closed for social distancing: workplaces, schools, and college campuses.
“Right now, American Red Cross faces a severe blood shortage due to an unprecedented number of blood drive cancellations during this coronavirus outbreak,” the organization said, urging healthy persons to donate blood, platelets and plasma. “This blood shortage could impact patients who need surgery, victims of car accidents and other emergencies, or patients fighting cancer.”