I don't think the Buddha considered suffering unreal. He said life is suffering, starting with the trauma of being born. Certainly the trauma of giving birth is real.
Why would unreal suffering be at the center of a core teaching, the First Noble truth? Suffering is here and now. It will pass, but it will likely take some other form. Then it will exist in that new form. But it will be real then, too, as will be the causes that give rise to that suffering.
The Buddhist view on Emptiness tells us that experiences are relative or dependent and fleeting. It also tells us that the self does not have an essential nature. What this philosophy does not say is that the quality of human experience is meaningless. If it were, then there would be no basis for wholesome actions serving to enhance experience. Also, if the quality of human experience were meaningless, then the notion of Right Intention that is central to Buddhist ethics would have no relevance or application.
We value things that much more more knowing they are temporary. Knowing that something good and beautiful will cease in its present form can be part of our learning, and appreciation. Likewise, knowing that something is a cause of suffering that will cease in its present form can be part of our learning, and appreciation.