[ceejayoz]

NPR accordingly and responsibly titled it "might not be", yes.

[charbonneau]

Not sure if it’s reasonable. My gut interpretation (before reading the article) was “breakthrough infections are overblown”.

I prefer their alternative headline “What the latest COVID research says about breakthrough cases and transmission”

[ceejayoz]

That's the correct interpretation, should the preprints survive peer review and further research support the early indications.