Here are the two that get my goat, "3. Interns enjoy workplace protections" and "4. Not paying interns is legal." The two seem to cancel each other out. In practice yes, interns do not enjoy workplace protections under US law (maybe under individual workplace policy, but not law) because they are not employees. By the same token, in practice not paying interns doesn't seem to be anything that has been prosecuted. The author Ross Perlin quotes a court case for the failure of legal protection, but a law and a statement that unpaid internships are "probably illegal", which is kinda weak.
I have no disagreement with #5, "D.C. interns just answer phones." I agree they do more than that.
My disagreement with Perlin on #1 and #2, "Anyone can do an internship" and "Internships lead to full-time work" are in that the statements are just fuzzy and board enough that it can depend on perspective. My problem with #1 is that he seems to argue against a statement saying "internships are paid and easy," not the statement written. For the #2, the answer is maybe. When I was more involved in my professional college's alumni association I encouraged students I talked to about the importance of internships and library (my profession) related work experience. Unpaid has it's perks (not as great as paid) in that it can get you in the door of more prestigious spots. For me it was the Library of Congress, not the little known archive no one has heard of. Of course I was there too and re-encountered the man I'd marry, and the people who were excellent references when I did apply for the real world jobs.
Maybe it's a grad school thing, but getting some work experience in your chosen profession, be it paid or unpaid is a must, even if it is only for a semester because it is more than nothing. For the Help's last semester, talked him into (including some begging) to do a practicum, or unpaid but grad school credited work at an institution that wasn't his. So using his annual leave, he'd work downtown for free at another archive for an institution that was slightly related to his library's focus. He's made contacts for himself and his library and museum, improved his knowledge and made links in other areas of his professional/semi-professional life. For myself, my internships and work-study work showed up on my resumes and KSAs. They were proof that I knew the work.