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To be clear, your rating isn’t really over the past 12 months, it’s over the the current quarter plus the previous 3 quarters.
If you’re looking at the next Superhost assessment (starts April 1, 2021) , then you can only count reviews between April 1, 2020 and March 31, 2021. (i.e. not from Jan 29, 2020 to Jan 28, 2021).
BTW, I read on Airbnb that they count reviews based on the date the review is submitted instead of the checkout date of the reservation associated with that review, which is a change from a couple years ago.
And they do all of the math for you. You can go to Performance and then to Superhost and then change the dates for the period if needed and you can see how it has been counted. If the 1-star just came in, you might have to wait a few days for it to be accounted for.
It’s been like that since I started hosting in late 2016. That’s why hosts don’t necessarily get notice that they’ve made Superhost until 14 days after the assessment date. If you had a stay that ended Dec 31st, they wait until that review is posted to do the Jan1 assessment.