the main source i can find that seems to be the origin for "10 BYD dealerships burned since 2021" (carscoop) references this article:

https://www.ntdtv.com/b5/2024/05/16/a103881785.html (which actually lists 11 minus the most recent)

translation seems to be mostly accurate, but i can't be arsed into researching the locations listed.

but yes, tens of dealerships per month seems like a bit of an exaggeration