Elon knows you can do a lot of stuff while being a CEO. if you're super competent it can be done in a few minutes per week if that, same with being a father of a child.
Elon’s fatherhood performance shows how well a few minutes a week works. Of the 13 children, many dislike him. And those with children would know that it’s very hard to get your children to dislike you. You have to be royally insufferable.
I interpreted the comment about fatherhood to be sarcasm.