The article is all about how he doesn't want to communicate with people unless they are in his specifically selected group of people he thinks is OK. So allowin

The article is all about how he doesn't want to communicate with people unless they are in his specifically selected group of people he thinks is OK. So allowing blog comments would probably let anyone communicate, which is what he dislikes about Twitter. So I see the blog comments being disabled as more in line with his philosophy, at least.