The author explains his method in the prefaces. Those topics are far too advanced to start teaching children a language. When I learned English as a child the first day was spent learning about the letter A. We had to write A over and over again on weird green paper between horizontal lines. It took a lot of practice to get the A consistently between the lines. We did the same thing every day for all the capital letters, but only after we mastered the previous letter. Then we learned that there is another version of letters called lowercase and we had to repeat the drill of writing each lowercase letter over and over, until we got it right. There was no mention of advanced topics like vowels, consonants or punctuation at the earliest stages of language acquisition because that would confuse and bore and ruin the child's ability and desire to learn. Remember we're talking about children here, potentially very young children.