As a mother of three children, I actually try harder to take more pictures of all the kids and individual ones too. How else am I going to remember that they were ever this small? I also try and give them individual attention even if it is for 5 minutes. Kids need that to grow and blossom into amazing people.
I think that a parent who doesn't take pictures of their kids or spend time with them is either super busy (maybe not in the right way) or they never were a big picture taker in the first place. There are hardly any pictures of my husband from when he was little and that is partly because he was the third child but also more because his parents really don't take pictures. It just isn't their thing to do. Can they tell stories about when all 4 of their kids were little sure. I bet the guy who wrote the article won't even be able to do that. He's too busy not being a parent.
If you notice yourself not doing something then you can change it. This guy, could easily change his behavior to start taking more pictures or include his 2nd child on trips out to the aquarium. I seemed to get the impression that he was just to lazy to realize this.