I think you could just replace natural immunity with immunity in this post. There's not been evidence suggesting natural immunity covers a narrower spectrum than vax immunity, and we don't have updated vaxxes yet, so it's still not clear why you'd treat those two groups differently right now, if it were based on the science alone. Also I'd have to defer to Whitinsville, etc., but I presume the 10mo study I posted above is going to encompass at least a few strains so it's not totally narrow. Even Delta is not reinfecting people in large numbers, or at any rate if it is, the outcomes are less severe as they are with the vax.