> Ioandis' original study was in Santa Clara County, CA, where they estimated 0.17%. I don't see how New Jersey, for example, materially differs in a relevant way in terms of population statistics from Santa Clara.

I doubt it emerged early enough for this to be specifically relevant to the study in question, but something like the more-transmissible-but-less-deadly California variant would be a pretty big differentiator between California and New Jersey.