Interesting: this is a 2014 post from Jonathan Blow reproducing a 2014 comment by John Carmack reproducing a 2007 e-mail by the same Carmack reproducing a 2006

Interesting: this is a 2014 post from Jonathan Blow reproducing a 2014 comment by John Carmack reproducing a 2007 e-mail by the same Carmack reproducing a 2006 conversation (I assume also via e-mail) he had with a Henry Spencer reproducing something else the same Spencer read a while ago and was trying to remember (possibly inaccurately?). I wonder what is the actual original source (from Saab, maybe?), and if this indeed holds true?