It's a real book and he has a documentary as well. He either really believes this stuff or he's content to appear like he believes it in order to make some money. The two are indistinguishable in terms of the harm they cause.

In Soviet Russia, bus make *you* stop.

There's more info here: http://archive.woz.org/letters/general/78.html

Basically he buys legitimate $2 bills on uncut sheets and then has a local printer gum them into pads and perforate them. It's legitimate tender, the only unusual thing is how they're presented.

As for anyone who thinks that making something that looks like currency is okay in any way, I'd suggest a revision of forgery laws may be in order