They reached "scientific breakeven", you are referring to "engineering breakeven" or "economic breakeven". The vocabulary here is nicely defined: https://en.m.w

They reached "scientific breakeven", you are referring to "engineering breakeven" or "economic breakeven". The vocabulary here is nicely defined: https://en.m.wikipedia.org/wiki/Fusion_energy_gain_factor https://en.m.wikipedia.org/wiki/Fusion_energy_gain_factor