My impression was she just brings the typewriters into class as a one-day novelty thing per course, not that it becomes the norm for the whole semester. The goal is to give the students a taste of what the old-fashioned way is like, to get them thinking about it.
If you believe this, people believe everything they read by default and have to apply a critical thinking filter on top of it to not believe the thing.
I know I don't have as much of a filter as I ought to!
That checks out with my experience. I don't think it's just reading either. Even deeper than stranger danger, we're inclined to assume other humans communicating with us are part of our tribe, on our side, and not trying to deceive us. Deception, and our defenses against deception, are a secondary phenomenon. It's the same reason that jokes like "the word 'gullible' is written in the ceiling", gesturing to wipe your face at someone with a clean face, etc, all work by default.
Another feature I would love would be the ability to get a printable version so I can hand it to my kids. With that it would be great to have an option for a line-by-line translation (maybe side by side so they could cover half the page to hide it) and then another option without a full translation but with a little dictionary at the bottom so they can look up unknown words.
And my preference in general would be for a more literal, word-for-word translation so I can learn what each individual word means.