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> What if the languages available do depend on what the lesson is about?

Then it would be a completely different schema that would just be in 3NF.

If you look at Kent's variations you will see that they work hard (graphically) at making sure that you do not assume dependency between language and lesson.

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The point is, the schema is not inherently unreasonable as the article is implying. There's a reason to make the comparison and take both versions seriously, not just show off the normalized version.

Yes, absolutely, just present it in "historical misunderstandings" section.

My only concern is that it is presented as if it was something natural to begin with.

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