Maybe it's the way the article has been written and edited, but from the brevity of SK's answers and the slightly dismissive tone, you get a sense that he isn't enjoying the interview. Perhaps, after all these years, SK doesn't like his credibility still being questioned.
I think it's interesting, but largely irrelevant, how successful authors write. With the luxury of a large bank account, your craft being truly a full-time job, and never a question over whether or not the next book will sell a squillion — let alone be published — the mindset and work ethic is on another level.
But I'd like to give it a try...