You're right. In my head "ignition"=fusion, so I was auto-translating as I was skimming. They're looking for something slightly different, and probably using

You're right. In my head "ignition"=fusion, so I was auto-translating as I was skimming. They're looking for something slightly different, and probably using energy output (among other things) as indications of self-sustained fusion, which we've certainly obtained in bombs (fission explosion sets off fusion reaction ☞ big bada boom).