BYD is definitely slowing down. They are cutting prices to increase domestic demand and have cut back worker shifts at their Chinese factories from three to two per day.
I'm afraid that customers are more price-sensitive now, and a BYD definitely can sell for less than a Tesla.
That was last quarter.
I'm not sure how this goes in the long term though, likely to worse. For example BYD sold almost twice the number of cars in the same period and they don't seem to be slowing down.