Yes, but it doesn't mean they're considered American. If you would, according to that logic you'd have to say that the iPhone is a Chinese (Korean/Taiwanese) product.
But yeah it's a bit silly to bring nationalism/politics into a comparison of car sales. The whole comparison is really designed to mislead people who don't know better and don't look any further, to conclude something that isn't really true. Because where various manufacturers produce >10m cars, and multiple American manufacturers did >6m, Tesla averaged about 0.1m last year and will do about 0.25m this year. That's pretty sweet, but not the conclusion most people would have when they read a Tesla car was the top selling American car in the US.
But yeah it's a bit silly to bring nationalism/politics into a comparison of car sales. The whole comparison is really designed to mislead people who don't know better and don't look any further, to conclude something that isn't really true. Because where various manufacturers produce >10m cars, and multiple American manufacturers did >6m, Tesla averaged about 0.1m last year and will do about 0.25m this year. That's pretty sweet, but not the conclusion most people would have when they read a Tesla car was the top selling American car in the US.