I don't know that he won't be sued and neither do you.Except, conveniently, none of these cases are going to court. So there's no risk in slighting an election by making last minute claims at the peak of it.
But for the sake of argument, let's assume they aren't going to sue him civilly. Let's further assume that whatever statutory criminal violations might have been in play are null and void as an operation of the statute of limitations having run. Imagine you're one of those women and you're telling the truth. You know you can't move a criminal charge. You're fairly sure he has enough money to paper you to death in court and ruin your finances trying to keep a single lawyer in play. All the more reason for you to advance your narrative, to take whatever satisfaction and redress harming his attempt to make America irate again can give you.