Sure, but it's only six (6) specific illnesses. There are tens of thousands of illnesses. I'm almost 100% confident you could cherry pick any six illenses to get any outcome you want.

Edit: Seems the lead author is also a vocal supporter of universal healthcare, being a senior fellow of the Center for American Progress. So yeah, probably why it's such a strange setup, and what compelled me to check since this kind of thing is super common for "activist research".

I guess the takeaway is to always take a study for what it is, rather than what it paints itself to be.