This author is pointing the myriad of actual reasons why "your personal medical data" is stunningly uninteresting to healthcare providers and not at all a simple problem to solve.
The reality is that HealthKit is going to be a victim of Apple's inability to play nicely with others, in addition to its other technical limitations also described in the post. However, Apple has positioned it so that when it does flop, they can play off as the big bad medical industry refusing to embrace change.
EDIT: This is not snark. It's an observation. Recall last time with iTunes Steve Jobs managed to get all the music industry players on board even though the deal wasn't in their favor. I doubt Apple will be able to achieve the same in the health industry without Steve Jobs at the helm.