Nice try.
Here, Oxford University Press. And a place called Harvard.
https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciab465/6279075
SARS-CoV-2 proteins were measured in longitudinal plasma samples collected from 13 participants who received two doses of mRNA-1273 vaccine. 11 of 13 participants showed detectable levels of SARS-CoV-2 protein as early as day one after first vaccine injection. Clearance of detectable SARS-CoV-2 protein correlated with production of IgG and IgA.
I’m not sure what this is supposed to prove. The link specifies that S proteins were detectable in plasma and that antibodies then appeared and the S proteins disappeared.
What does this have to do with the Red Cross policy around blood donation for vaccinated persons? The Red Cross accepts blood donations from vaccinated persons. It says so right on their own website. The Red Cross is updating their policy on plasma donations to align with updated FDA guidance. It again says this right on their website. This is a discussion about Red Cross policy and the Red Cross’ own website is clearly the most authoritative source for what that policy is.