That is a very poorly written headline. 72,410 adults were deported who said they had US-born children. So to begin with, the number of children isn't listed, the number of parents is. The number of children being discussed could be less than, equal to, or more than the number of parents.
Next, the article clearly says that some of the children go with their deported parents. The number of children who stayed in the country while there parents were deported is not indicated.
Next, the children who stayed in the US are described as remaining "with another parent or family member," while "some children end up in U.S. foster care." So some of the children who remain are remaining with a parent.
Next, nothing in the article actually claims that the children were forced to be separated from their parents. There is no indication that the parents cannot choose to take their children with them. I don't know what the ICE policy or policies may be in the situation where parents are deported that have US citizen children, but since the article says some go with the deported parents while some remain, the parents may well get a choice.
Of course, this doesn't mean there isn't or can't be any hypocrisy when it comes to looking at the way the current administration is enforcing immigration law compared to past administrations. However, the article does a terrible job of trying to make its point.