The iPhone Tab Bar
significantpixels.com
significantpixels.com
However, when testing the app, I found this was rarely useful in practice, and completely not worth stealing the bottom pixels of the screen where a real toolbar could go. So I switched to Twitter for iPhone style, with the navigation bar as the "top level" element and the tab bar shown only at the root level.
Might not work for all apps, but I think Apple should try to suggest that structure as well, since it does make more sense than their "tab bar always visible" design for at least some apps.
That being said, Apple does use that structure in the iTunes app when you're playing a song. However, from that view you cannot push anymore view controllers: the back button will always take you back to a screen showing the tab bar.
This article has a lot of good points, but it's much harder to take seriously when it sounds like it was written by someone who didn't pay enough attention in English class. Yes, I realize there's a good chance that this person is a non-native English speaker, but if you want to be taken seriously, that's not really an excuse.
I will leave you with this: http://www.codinghorror.com/blog/2011/02/how-to-write-withou...
If he made so many mistakes the meaning of the post was lost, maybe your pedantry would be relevant. However, in this case, all you've done is wasted everyone's time and now we're discussing minute grammatical points in a writing-unrelated post.
And I thought I was a grammar Nazi.
This looks to me like a typical personal blog where a non-native speaker jotted down his notes about a certain topic. The text is perfectly understandable and the grammar mistakes are harmless. Take it or leave it.
I also disagree with your characterization of the amount of work that went into the blog post. From the number of screenshot examples and the overall structure of the piece, it looks to me like the result of a significant amount of work.
That said, direct feedback (like through the links provided at the bottom of the article) is probably a better way to let the author know about (and correct) the mistakes than a comment on HN.
To my mind, it also shows an insular anglosphere-centric perspective, one to be avoided.