There are many typos, in fact. I personally find it really distracting and wish authors of articles with interesting content would get someone to proofread before publishing them.
I'm grateful authors take the immense time required to write something like this and then publish it free for all to read. I personally could care less if there are typos.
Is like to see an xkcd where one character ponders of another character is doing something just to get a certain reaction that they have just the right online comic to counter with.
Since web content is dynamic, I like to think that we're the proofreaders (that is, if the author makes themselves available for contact and makes said correction when someone points out a typo).
