Agoravox indicates all information is from Jean-Pierre Petit, who is mostly notorious as a "UFO-logist" and also other hobbies, like "archeology" - pretending the pyramids of Egypt were made with synthetic stone cast on location rather than carved blocks...
I let you infer the reliability of the claims. Besides, the machine radiated more energy than the kinetic energy of the plasma (presumably because of fusion ?), but that does not mean it has a net return: the kinetic energy eventually injected into the sample is a ridiculous % of the total energy spent to warm um and set in motion the whole thingie ( which then runs for just nanoseconds..)
That makes it just one more machine with marginal ability to fusion light atoms (such thin wire machines have been shown to fusion nanoscopic amounts of atoms many years ago, at much lower temperature). Whether it will catch up with the two leading technologies envisioned for power fusion (tokamak and laser shooting) remains to be seen.
As for the "straight-fusion mininuke" story, just look at the picture and the size of the machine (and they're not showing the tons of water needed for the Marx generators). Then you can imagine how practical it is...

Pierre