To be fair, I'm sure I disappointed my parents in some ways or times also.
Work is also not always a joy. Success is not always a joy.
But there's more than enough evidence to show that, when people look back on their lives, most of them most highly value their relationships and have the most regrets around how they managed those relationships.
Having a child doesn't guarantee happiness. Raising a child is not always going to be rainbows and I suppose learning to accept that the life you create doesn't mean you get to dictate what that life becomes is a form a wisdom. But none of this takes anything away from the experience if you accept it for what it really is.
What the author is at risk of doing, in my opinion, is pretending to a certain extent that he can have his cake and eat it too. As I wrote in my original comment, "you can't have it all."
Please don't take this to mean that you have to choose between your family and career (or a business). That's not what I'm saying. What I'm saying is that, at a certain point of "ambition", there is no perfect balance possible between all the the things you're trying to maximize.
The wise person accepts that sometimes you have to make choices, and choices always require that you give something up to get something else.