This was essentially the explanation I got on it too.
The breakthru is basically the confirmation that you CAN get net positive energy out of a fusion reaction; but the methods we have to use to get the heat and pressure are still miles and miles and miles away from practical. The engineering required to make this sustainable and practical is mind boggling. But then so are the benefits of unlimited, low-cost, green power.
The laser research is much more important in terms of near term future practicality - for military use. I have a friend who sells laser jeeps for Raytheon, (ostensibly) to shoot down drones. Those lasers will just get bigger, more reliable, longer range, etc. They are certainly a much cheaper way to shoot down missiles than using other missiles.