Your reply implies that in this specific case there is no fusion. I know that plasma can occur without it, but this discussion is about the specific machine.

You make the plasma before any fusion can happen.

Just there being plasma there means nothing, you inject it on the machine already that way.

In the case of this machine it implies that they got plasma by fusion. Which means the fusion is working. It's a milestone, albeit one of many.

You don't ever create plasma via fusion, fusion occurs in plasma that has reached a certain temperature and density threshold.