I hope your last sentence is meant to suggest technical interns should be paid above minimum wage, rather than that only non-techs should be paid fairly?
I think that goes without saying; technical interns are in high enough demand that if you're not paying minimum wage they have options elsewhere.
Where I am (midwest USA) technical interns are typically paid at least twice minimum wage; offer anything less than 175% minimum wage and engineering students will dismiss you entirely.
As I understand it he's commenting more on the internships discussed in the article, those in the film/music/publishing industries, that typically go unpaid.