There's a few things missing in this article. It goes on the assumption that a PhD is actually a training ground for budding scientists. In reality, it's not. Yes, the students get good training but they are in fact, carrying out the work of their supervisor. Getting papers out is only a byproduct and many times, is at the discretion of the supervisor. The best interests of the students and how they can apply their lab experience to their careers rarely comes into it. If you are really lucky, you will get a good mentor who will actually take the responsibility of training you for a future career but that is VERY rare in today's day and age.
In Canada certainly, medical research is done on the backs of the phD students. In the US, it is done on the backs of the post-docs. In the UK, it is done on the backs of PhD's who have little training in their short degrees and are in absolutely no position to compete for faculty positions. PhD students in the UK pretty much get a degree and not much else.