The article suggests that the following in italics is a Watchtower directive:
The Blood Issue: There’s talk about the FDA allowing doctors to treat critically ill COVID-19 patients with “convalescent plasma therapy.” It would be wise to advise the publishers that it’s understood that this is giving the patient the whole plasma of the person who has developed the antibodies which would be unacceptable for Jehovah’s Witnesses.
However if the antibodies were extracted from the plasma (fractions/immunoglobulins) and then given to the patient, it would be a conscience matter for Jehovah’s Witnesses. Some doctors may view plasma as a fraction. Therefore the publisher may need to explain their personal decision not to accept any of the blood’s four main components, one of them being plasma.
I doubt it.