tl;dr: "nonalcoholic beer provides water, polyphenols and carbohydrates (which together) aid metabolic recovery"

Polyphenols are a broad class that includes lignans, tannins, flavonoids, and stilbenes; I usually hear about the stilbene resveratrol in "alcohol is good for you, actually" contexts. They're also in wine, and in both wine and beer can be dependent on variety and origin.[1]

1: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663142/#B132-m...