It looks genuine to me, although quite why it was being filmed raises a question. What interested me was that something appears to trail behind the aircraft (vapourised metal?) for several seconds after the strike . It does show that bonding works well in most cases to protect aircraft
I would say thats genuine, albeit lucky to be in the right place at the right time and not have some cloud in the way to mask it. It's a nice graphic example that lightning goes in one side and just comes out the other without causing any damage (apart from some small burn marks on the paint where it enters/exits). Sometimes you get a 'hot' smell in the cabin afterwards which keeps the pax a little flustered for a while longer
Wouldn't be surprised if the Douglasaurus Rex in question (it's a FedEx DC-10) lost part of the tailcone from that strike. The glowing ball behind is probably most of the airplane's static wicks vaporizing from the discharge. We had a CV-580 hit at Air Tahoma while on approach to Memphis (DHL run from Cincinnati) that got hit by lightning and it took all of the static wicks on the tail (vertical and horizontal stabilizers) and the tail cap (fiberglass). The mechanic checked all the wiring in the plane since it's not quite as well insulated and isolated as on more modern aircraft, but nothing else seemed to have been affected.
Doubt it's Qantas. According to the upload info, it came from someone in the US and it appears to be taken from a back yard instead of a hotel.
As for it being a twin, it looks too long to be an A300 and FedEx isn't flying any 757's yet and that's the only color scheme that can be for a US-operator.