Just speculating but could this perhaps be Apabetalone. The third paragraph is almost exactly the wording Don used in the latest YouTube interview. It wouldn't be much of a leap to think Pfizer and RVX would work on this together given the working relationship with Pfizer and Zenith 

Pfizer has found a leading experimental drug candidate against SARS-CoV-2 and is planning to test the drug in the coming months.

This is according to The Wall Street Journal, which was told the facts by Pfizer’s R&D chief Mikael Dolsten in an interview with the financial paper. 

He told the WSJ that early R&D has shown its candidate blocks the new virus, which causes COVID-19, from replicating, with hopes it could slow or stop the spread of the virus in patients with mild to moderate symptoms.