No. Notice how it is worded.

> "More importantly, Moses said, the mechanism that generated the powerful energy burst appeared to be the self-sustaining thermonuclear fusion process that defines ignition."

In other words, they did not achieve ignition. They achieved something that is necessary to get ignition. Specifically, alpha heating.

This is another important step on the road to ignition. It is not, however, ignition itself.

Why do you think the title of the article says "Marks Progress Toward Ignition," rather than "Finally Achieves Ignition?"