We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
There's plenty of evidence that if you go in a cold plunge that's too cold, you're going to attenuate your immune response. And there's thousands of anecdotes now of people who said, "Oh, I just cold plunged like crazy and then I get sick."
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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And I think if you do too much cold plunging, there's tons of anecdotal evidence to suggest this is going to negatively affect your immune system.
I believe that if you did a cold plunge immediately after, you would lose some of the immune cell-stimulating effects, because unlike heat, cold appears to blunt inflammation/circulation.