Yes that's true, the 0.1% percent is phenomenally richer by definition a bigger contributor to inequality, and for the most part enriches itself entirely differently. That said, just as inequality is deemed unfair (I understand that's not the reason to oppose it), protectionism of these "guilded" industries can be deemed unfair in its own right. More practically, the inflation of doctor's compensation could inflate healthcare costs to the the point of contributing to inequality more as a leech on the poor than boon to the rich.

tl;dr, the things this article points out are definitely bad, if only for the immediate justifications given rather than the article's thesis.