oh, so you only mean like the gamified nature of duolingo? Lots of language apps have lessons that are interactive versions of language books and they also include conversational practice with language models. Conversational practice with humans is not necessarily easily available nor is it that appropriate if you are just learning a language and can't have simple conversations yet. Babbel for example is pretty comparable to a traditional language class in how it's structured. It's pretty convenient that I can use it any time of day and as often as I want, from my car or whatever.

I suggest that they meant that the process does not involve "reading a book" or "talking to people."

In most of them, you talk to people with an equally horrible accent as you have.