Question about FDA decision of deferring blood donations on PReP

I’m wracking my brain today. I was signed up to donate but found out you cannot be on PReP and must quit for 3 months

Did a deep dive on the FDA guidelines and their reasoning is “because PReP can give false negatives on hiv tests”

This is beyond absurd to me as it’s in the regimen that being on PReP one gets tested every three months.

So FDA requires PReP users to get tested but also says it could cause false negatives.

This makes no sense. So the 10s of 1000s on prep in the USA getting tested may all have false negatives?

To me it’s really the FDA just not trusting gay men.

Anyone with good knowledge or a doctor make this make sense.