The article makes several good points, however, I think it sugarcoats the "baby mama/daddy drama" that affects many of these types of relationships. When a couple have a child, there is an eternal connection. Even though they no longer wish to have a relationship with the other parent, they play vicious games and can cause great pain perhaps because they are still going through the pain of their separation/divorce.
Some biological parents won't speak to the step-parent for any reason and are extremely disrespectful. Other biological parents berate the step-parent to the child on a regular basis which is extremely confusing for the child. Dating a person with young children is an extremely difficult thing to do. The difficulty can intensify greatly if the new couple choose to have children of their own.
I don't think there is a way to summarize how to date a single dad in any article because these situations are unique. One of my best friends has custody of his daughter which makes it easier, but she is a teenager now and is jealous of the attention dad gives to other women and has no problem demonstrating that fact regardless of what her father does. She wants him all to herself, and she can't be blamed for that - she is too young to understand adult relationships.
This is an extremely complex topic that should be examined for a very long time prior to deciding to enter into a relationship with people who already have children.