I would hate to live in a world where, when people randomly guess something correctly, they feel vindicated and emboldened to say other random guesses that are as completely unfounded as the one they happened to get correct.
But I'd point out, this wasn't a random guess. There has been a whole lot of circumstantial evidence for a long time, it's not quite a smoking gun but better than a guess for sure.
Or an educated guess where labs in the area were studying this exact type of virus