Neither, it's quite a huge subject, so if you put in the time you'll surely be able to figure it out! I don't think that the article isn't sensible, from what I saw it seemed quite well-written and the site usually has good quality content. The thing is that it targets readers with a certain knowledge-level.

It's difficult for me to tell how much you know about graphics programming in general, so I can't really point you to any resources that would be better in your particular case!