Understanding distortions in investment in human capital

I am currently reading Economics of The Colour Bar by WH Hutt, and I’m having trouble understanding this bit he has written: “But when the price of any commodity is raised above the free market level, by strike threat or action or by state edict, the effect is always regressive, harming poorer consumers more than wealthier consumers. Moreover, such a process distorts investment in human capital. It causes, inter alia, relatively more people to be trained for and employed in occupations if low productivity and remuneration, and hence relatively few to be trained for and employed in occupations of high productivity and remuneration.”

I don’t get the part where he talks about more low productivity jobs will be created and HENCE relatively few high productivity jobs will be created. How does this work? If I’m selling some commodity above free market price, if I’m making a profit, why would I hire more low productivity folks than high productivity folks? Is it because I’m assumed to be losing money for going above the free market price?