I’m not willing to call it a hoax, but it may not be applicable for residential uses. It may only prove useful for industrial or military.
Well, depending on the specifics, without pollution concerns, you could really scale one of these suckers up.
Instead of messing with a MW generator, try a massive 1 GW generator. If most of the cost is in construction, you build as big as you can under existing construction methods and enclose it into as small a surface area as possible.
Say it were 1 metre cubed, you’d build it 10x10x10. 1000x more space on only 100x the ground. You’d substantially lower your per unit cost by a factor of around 10, meaning that your 300k computer is now 30k.
Depending on the weight, I really can’t see these things being used for transportation, unless of course you are looking at things like aircraft carriers.