That isn't an extreme example at all, people used to mill grain and make clothing by hand, now we don't. We somehow are not sitting around getting fat even though technology takes care of those tasks.

The parents suggestion is that if we don't have to learn languages that will lead to us all laying down drinking big gulps while robot slaves take care of us. Their take is the extreme example. People have literally made this same suggestion about every technological advance and it never comes true.