Should have named it "C Tuesdays" since there's basically nothing related to Objective-C in the article...
True, but Objective-C is a strict superset of C, and there are a large number of new Objective-C programmers that never learned C, or only used C in a class or two at school, and need a refresher.
Not a very good article. It seems to be targetted towards beginners, but it goes into rather obscure stuff that someone learning the language shouldn't have to know right off the bat. It comes off as though the author is trying to impress rather than to teach.
I'm trying to provide a concise overview of different language features and to highlight some common gotchas when using them. I'm assuming that most of my readers already know how to program well in at least one language, but are inexperienced with C and Objective-C. I agree that it's not a good tutorial for people just learning to program.