If a legal interpretation is reversed, all previously decided cases are reversed. If the Supreme Court finds that the Constitution does not mean birthright citizenship, then previous falsely given citizenship is removed.
Somewhat circular logic there. The Rubios were having trouble getting citizenship, so they had anchor babies(a loophole which still existed back then). If their children lose citizenship, they are no longer anchor babies.
They had fled Batista, and had supported Castro. That made it impossible to get a Green Card until they had several children.