He points out Hasin Hayder's post on the subject. Hasin (ironically author of a Smarty book) has recently come to the conclusion that there "is no need to use an external template engine like smarty".
Some nice guys over there developed smarty and it saved life of a lot of developers (i mean developers). But that time is over. Seriously why the hell I need to learn a new templating language when a "echo" does the thing much better.