This is actually the one that I would agree with (edit: see below), if the difference is "professional" vs. "academic." I certainly wouldn't call a natural science degree professional, and if you're in a research institution studying some form of engineering I'd probably put you in the same category. Just my experience/opinion though (and the rest of the exclusions are super stupid, I agree).

Edit: from the replies, this is referring to Professional Engineering; in my corner of the world, "Engineer" is an overloaded term that generally means electrical, mechanical, software, and sometimes computer engineer. My comment was referring to these engineers, who are rarely licensed and study alongside scientists in school. I completely agree with parent in the context of "professional engineering" (I mean...it's right there in the name...).