The key element in this article that I have not seen elsewhere is that variants A and B both originated in the Wuhan market, separately. (In fact, they found B first, but a twist in data processing gave the other variant the "A" name as if it was first.)
Anyway, they show two independent strains developed in the same place, as the same time, in the same corner of the market. So the situation was so ripe for cross-contamination between species that COVID not only spawned there, but did so twice, in a short amount of time, and went different directions. (A and B are apparently completely different variants of the same base virus, and one is not a progressive mutation of the other. As far as I can discern with my degree in Fashion Design.)
That's the only bit of new information I saw in this article, and I found it interesting.