What does it say? Nothing. With millions of visitors and 33K locals, it’s all noise and no signal. Even the vax rate is all noise. A tiny fraction of people getting vaccinated while on holiday would be enough to mess up the counts.
If you want to know whether breakthrough cases are rare, take a look at Watfly’s MN page. SCC also breaks out the vaccinated case rate from the unvax. For SCC, the jab reduces your odds of a positive test by about 82%: from 33.7 per 100K to 6.2 per 100K.
covid19.sccgov.org
It’s an 80% reduction. I’ll let you worry about whether that counts as “rare” or not.