I think you're right that people who have recovered from the virus should not be "vaccinated" against it. I've been saying that and advocating for that all along. As a biologist and nurse it is what makes the most sense to me.
But I'd really like to find some evidence that the Red Cross has acknowledged the vaccines destroy natural immunity. That would be absolutely huge! Like you, I've had a look, and I can't find anything to support that claim, other than the brief clip that sounds like a female mainstream media news reporter. The Red Cross denies that is their stance, and specifically says they welcome donations from "vaccine" recipients, even the next day after receiving it, inviting donors to bring their "vaccination" status card with them. Perhaps they aren't using that blood for convalescent plasma therapy, I don't know.
If they've changed their official viewpoint and tried to hide their original announcement, surely there's still some record of it. We all know that once something hits the internet, it can never be removed. It's gotta be available. Somebody would have been able to find it by now.
Also, where's the original news report? How could that also have been disappeared and leaving no evidence?
It it really happened, there's got to be something... other than a single unsourced anonymous voice clip.
We could get an unsourced anonymous voice clip that says Bill Gates has admitted the "vaccines" are a depopulation plan. But without knowing where that clip comes from, and with Bill Gates himself publicly denying that's what he said, and no evidence that he said it, what do we do? Clearly, the info (the "vaccines" are about depopulation) is true, but did Bill Gates admit (and then retract) it? Did the Red Cross admit (and then retract) that Covid "vaccines" destroy natural immunity?