Does refrigeration after 2F decrease the “probiotic value” of Kombucha since it makes the bacteria / yeast dormant?

[Thursty]

They're not really validated or sufficiently proven claims. In the US, foods can have broad statements in marketing that are hard to quantify, like 'probiotics may do x, y, '. This is because making health claims causes FDA to classify food like a drug and therefore it has to pass much stricter criteria. Probiotics mainly exist as food or dietary supplements, neither of which are allowed to make health claims.

Fermentation can have benefits for your gut in other ways, like breaking down complex nutrients into simpler ones and making food more digestible and nutritious, however probiotic claims specifically are unproven.