Earlier quoted context omitted.
Two possibilities come to mind: Satire, as mentioned by other people, or the original teacher is lying about having used Linux. As anybody who has been around on the internet (or BBS or Usenet or...) for a while has learned, some people take a very scorched-earth approach to argumentation, and if lying about having tried Linux bolsters the argument, in it goes, regardless of whether it's true. (Maybe.)
It's also possible that the she was forced to use Unix in college. As she is not a techie, and probably wouldn't pay a very large amount of attention to the details, mixed the two up.
The way I read it she had to use the command line when she was in college, and thinks the GUI is "stolen" from Windows. (Hence the concern about legality)