The article is about mortal computers which don't sound very interesting or special. I mean you can build analog computers today and do backpropagation on them

The article is about mortal computers which don't sound very interesting or special. I mean you can build analog computers today and do backpropagation on them and slap the mortal label on them as if it was some consumer brand. The "mortal computer" is a red herring. What I find far more interesting is that he presumably had discovered an alternative to backpropagation.