Yes, that is no better.
But I'd have to say that most people who've used the iPhone for more than a few days would already be able to use it one handed, even for typing. Yes, for typing of course it's slower than using 2 hands, but for most other uses (browsing, rss/ebook reading, music player control, viewing calendar, contacts, sms and emails) using it 1 handed is just as fast.

From all the iPhone users I know around me (more than a dozen), I've never seen them use the 'grip and point' method past the first week of use. And many of them are female (non techno geeks), with small asian hands.

The 'grip and point' method that you mentioned is the posture used in most Apple demos and marketing materials and I guess most people may copy that method to try it for the first time. The advantage of that method is that it's easier and more accurate to point with your index finger, so this would be a good method to use for most people new to capacitive screens.