This reads like a very thinly veiled ad for the author's $500 Software Design web class.

Project based learning won't work, traditional learning won't work, only my class will work. In fact the source he quotes (himself) claims he can give you a year's worth of experience in an hour.

But why doesn't project based learning fail? Well, in his example Bob, who wants to learn network programming, pairs with Alice, who somehow mysteriously takes over the entire project and does all the networking code so Bob learns nothing. That's sort of like arguing that you can't learn guitar from a teacher because a velociraptor might stroll by and eat the teacher.

I don't know what type of learning is best, but I know you need a little more evidence then that for a post titled "Why project-based learning fails".