You really think it's feasible for a 2 year old to have an idea how a transistor works when all they want to do is watch videos of kitties and puppies on YouTube?
That said, while you could try and have your 2 year old build ENIAC out of from-scratch vacuum tubes I doubt you'll have much luck - I'm pretty surprised at the degree of success the author had with text terminals at that age, to be honest. As the father of a nearly-2-year-old this definitely has my gears turning...