Some of these interactive simulations for learning are called “Explorable Explanations” [1], coined by Bret Victor in 2011, the author of your second link (worrydream.com). For more examples, see [2].

Very much agree that this is what explanations and presentations should be.

[1]: https://en.wikipedia.org/wiki/Explorable_explanation

[2]: https://explorabl.es/