But this wouldn’t be the first claim of theoretical breakeven by a fusion device, would it? Haven’t other teams made claims of theoretical breakeven?

And whatever the scientific achievement, as I said I don’t know for (savvy) investors how important D-T would be. The issue is making a practical generator, not pure scientific research. We already know how to get fusion reactions to produce more energy than they consume, i.e., thermonuclear bombs. The practical concern is getting usable energy out. That’s the goal of FF, and I don’t know that a theoretical D-T breakeven would get the LPP team that much closer to that goal. Of course, I might be mistaken.