Fireworks and red pandas have both existed at the same time for hundreds of years. Red pandas first discovered in 1825 by a French zoologist. One would assume it didn’t just blink into existence (however, I can’t prove it). Fireworks came about around 200 BC.
One would presume that there’s been a lot of overlap.
It’s possible the fireworks exacerbated a problem but it’s not the root cause.
I mean, that’s been an accurate statement for decades.