OPs article seems to imply that it is getting majority of energy from fusion, the feedback process means that they believe the can ignite it in a pulse that will quickly burn out, but produce more energy than put in. This makes it a lot easier in terms of the traditional hurdle towards fusion, that for the continuous process you need a very dense high pressure plasma, which makes the engineering hard.
OPs article seems to imply that it is getting majority of energy from fusion, the feedback process means that they believe the can ignite it in a pulse that will quickly burn out, but produce more energy than put in. This makes it a lot easier in terms of the traditional hurdle towards fusion, that for the continuous process you need a very dense high pressure plasma, which makes the engineering hard.