As someone who thinks a lot about how best to use one's limited time; is child-free by choice; and, who is also interested in the societal value of good parenting... this article drew me in on a number of counts.
The concept of time dilation explored in the article is fascinating. But I think it's possible the author has some wishful thinking about how experience and memory works. Or perhaps is using a plausible formulation as a reverse justification for his own life choices.
Here is how my childhood memories feel to me. Ages 0-14 are like an opaque tunnel, through which my brain and developing body was shot, like a cannonball, in an instant. I have some fragmentary memories of having gone through that tunnel, but they are mere fragment. My 14 year old self, somehow and miraculously, ended up on the other side of that tunnel healthy and of sound mind.
Age 14 is around where something resembling "the recorded video of my early memory" begins. I have clear memory of various episodes from ages 14-18, and this was also a period of intense individual development for me. This was where all my inclinations, passions, and life goals started to come into focus. That turned into full-blown adult individuation in college, where my goal was to pull away entirely from societal/parental expectations and live my own life. In other words: pretty much everything I associate with my adult character had its seed-like start in my age 14-18 period, exactly the period where I was pulling away from my developmental dependence on my parents.
My childhood before then is a blur. That might be a depressing thought for parents -- that this kind of blurred and fragmentary memory of childhood is possible, given that parents often describe this period as one where they are "making family memories" -- but I don't think I'm the only one. Importantly: this doesn’t make early parenting meaningless. Good parenting is ethically and developmentally important even when it doesn’t leave the child with later-retrievable episodic memories. But I don't think the point of parenting is to create said memories. It's to create a healthy child who can develop and individuate on their own in adulthood.
The article talks a lot about childlike wonder, and seeking that in adulthood. I'm all for that. But what's strange is that OP seems to believe the only place to find that childlike wonder is in parenting of your own children. I am sure parenting can be one such way to regain childlike wonder, but surely not the only one. People can reclaim their childlike wonder in sport, art, hobby, play, and travel, among other things. What's more, I know many parents who haven't the slightest bit of childlike wonder when they interact with their children. Or any other children in their family. So I'm not sure it comes as naturally to everyone as OP seems to think it does.
Two adult thinkers on how adult humans spend their time that have interesting thoughts on childlike play are John Cleese and Alan Watts. Cleese discusses it in the context of creativity in his wonderful lecture, summarized here:
https://www.themarginalian.org/2012/04/12/john-cleese-on-cre...
And Watts had this to say about it: "... if you don't have a room in your life for the playful, life's not worth living. 'All work and no play makes Jack a dull boy.' But if the only reason for which Jack plays is that he can work better afterwards, he's not really playing. He's just playing because it's good for him! Well, he's not playing at all! You have to be able to cultivate an attitude to life where you're not trying to get anything out of it. You pick up a pebble on the beach and look at it: beautiful! Don't try and get a sermon out of it."