That was a very elaborate piece of marketing copy
This appears to essentially be a "pay for my course" post.
Very heavy on "my kid can read at 3!" very light on much useful information other than "this is for paid subscribers" and "you can buy it here".
Looks like it basically boils down to "We did spaced repetition with phonics".
> The details for anyone who wants to replicate this can be found in a series of guides [with 3 links]
But those are basically all "go buy my course" style posts.
This was the hook, the links in the quoted section (you know the actual "how") are basically just "pay for the course".
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Overall - it's an okish post, but this is 100% marketing material to make money.