It's both, really. The latter is (at least when used "properly") used in an ironic sense. https://www.grammarphobia.com/blog/2007/01/i-could-care-less.html
It's also possible that he said other positive things about the Broncos (maybe he said he was also a fan of the Broncos), that the journalist decided to omit (possibly to stir up a bit of controversy). I don't know of course, but those kinds of things can happen.
The principle is exactly the same. If the backward velocity of the pass is less than 10km/hr then it will float forwards. And players are often running faster than that (you originally said it was not physically possible for a ball thrown backwards to move forwards regardless of who's thowing it...
That's not true, because of the forwards velocity of the passer (and thus the ball when it leaves their hands). If the player is running 20 km / hr straight forwards and throws a completely flat pass, the ball is going to float forwards. Basically, as long as the backward velocity of the ball...
There's racist people in all cultures and races.
If we're interested in addressing racism, and want to help those groups that cop it worst, isn't it better to create an environment where *all* racial attacks are completely unacceptable, regardless of who it was said by and who it was directed to?