Re: I have no idea if it works, because I've got a beard
It's quite clever, that page. You've got a supposedly sceptical author, a reasonably well-written story, the appeal to (anonymous) authority who spouts some erudite-sounding bollocks.
The best bit is that the link to the net-file for your own cardboard pyramid is broken. So if you were mildly interested in this, you give up at this point, but are left with the miasma of "pyramids sharpen razor-blades" hanging in your sub-conscious. But if you really want to try, you give it a go, but does it fail because (a) it's all bollocks, or (b) because you built your pyramid wrong?
8/10 Well constructed hoax.