@violetblue
OK, so…no, they’re not using last year’s total or average as a baseline; they’re taking the 10th percentile of a 6-month period. That’s a perfectly reasonable metric for “about as low as it’s been recently.”
That part of the quoted post was wrong.
Details here: https://www.cdc.gov/nwss/about-data.html
The part that wasn’t completely wrong…