There's a whole bunch of weirdness spread throughout the post, like the section starting "Now we come to the concept of inversion, 1/x, a concept you learned so

There's a whole bunch of weirdness spread throughout the post, like the section starting "Now we come to the concept of inversion, 1/x, a concept you learned so long ago that you probably can’t even remember learning it, but in all the time since then, nobody ever pointed out to you that it is a conceptual impossibility!" and continuing through the author getting het up about the one-point compactification of the plane. There's something about clifford algebras that brings out the fanatic in people, the first time I heard about them was Pertti Lounesto posting all sorts of rants in sci.math back in the day.