I think here’s the key point:
An experiment at the National Ignition Facility of Lawrence Livermore National Laboratory is the first time in history that a human-created nuclear fusion reaction has been proven to create more energy than [em]the amount absorbed into the reaction itself[/em].
In other words, this is not “more energy than was used”, merely “more energy than was [em]absorbed[/em]”. Lasers are not super-efficient, and much of the energy put into them comes out as heat, so this estimation does not include that, or any other inefficiencies. This is not “theoretical breakeven”, at least not as I’ve seen it defined.
