Gotta call you out for a sensationalist headline and over-the-top one-sided article. People rewrite their codebases all the time, and quite often it's a very good idea.
I think mattacular wrote about the run-of-the-mill programming blog that gets submitted to HN. They feel more substantial than one of those spammy "125 free icon sets that'll turn you into a Design god", but they're mostly half-baked regurgitations of Software Engineering folk-wisdom, rehashed from a dozen other blogs which quote some testimony from a famous book.
No code, no maths, no algorithms, no statistics, no nothing.