TRUCK DRIVERS: They don't just move big rigs around. They also need to keep detailed log books, plan out routes, pass inspections -- and know how to talk civilly and constructively to DOT inspectors. An eighth grade education will not get you there. Especially on the last part. The back-and-forth of a high-school classroom socializes teenagers to work with authority. Most high school dropouts give up because they can't conform to those norms, not because they can't do the work. Trucking companies rightfully insist on a high school degree for exactly this reason.
FINANCIAL ADVISERS: Met any lately? I work in a co-lo space with several within 50 feet. They're all college educated, and they put non-obvious skills from their education to work, every day. They need to provide their clients with highly literate, personalized updates via quarterly letters. They need a sophisticated understanding of clients' expressed and unstated needs -- and you're not going to be fully capable of doing that with just a high school education. Some college-level psychology classes, history classes or behavioral econ classes will get you in the game. And if you actually want to be a financial adviser with some understanding of how markets work, an econ/finance major is your best path in.
Some of the other analysis is quite interesting. But the classification errors in this piece are more than just a matter of tweaking a spreadsheet. They come from a deeper misunderstanding of what many jobs are all about.