Alright, that's 100% fair, and you've specifically referenced my specific assertion in a non inflammatory way.

I'll have to admit this was something I came across a few months ago (or longer, but it stuck with me), and it may have been in a very pro-vaccine podcast.

Could be junk science specifically tailored to encourage vaccination. Plenty of that going around. IDK

Best I can find today is here: https://pubmed.ncbi.nlm.nih.gov/33718968/

Reinfection cited here is MUCH lower than 30% for the non-vaccinated; it's more like 6% (with a bazillion qualifiers; even this number may be misleading, but in a way that suggests "natural immunity" after infection is highly protective).