Just clarifying that the net gain in energy in this experiment isn't in reference to the actual total amount of energy the facility used to achieve ignition. What they mean is that the fusion reaction produced more energy than the amount of energy the laser imparted onto the fuel. Inefficiencies in producing the laser beam and any energy the laser failed to impart onto the fuel are unaccounted for.

That said, this experiment isn't meant to account for those inefficiencies because it's not supposed to be a practical reactor design. Rather, it's just a test bed for finding out if it's actually possible to achieve a net gain over the energy imparted onto the fuel, and it looks like it achieved exactly that. So while we're still a ways off from applying it to commercial power generation, it's a very exciting breakthrough nonetheless!