Its not fusion, he's created a plasma sphere - the same kind of thing you can buy at any kitschy gift shop for about $75 or so. Real fusion implies getting more energy out that what you put in, and there's nothing here within the link that indicates this simple fact.
Not true. Real fusion means getting atomic nuclei to "fuse", and thereby transmute the original nuclei into a new type. In this case deuterium to helium. It says nothing about the energy balance.
However this style of fusor at least has the potential to generate more energy than it requires. However the devices, while cheap, wouldn't last long.