That is not true though. All we know she does not know Dinah and Roy. We know she is aware of John Diggle. Or we seeing the birth now because it was always plan like that. Especially with how the FF story was set up. If a FF episode is taking place they have to include Oliver in it somehow. And they will not show them in 2040 at least for now. And Oliver still have to have a significant role since he is the father of Mia.
It would kind of also suggest that Oliver left his pregnant wife go off alone. With no one at her side. Which we know is not the case. Because he is there at birth and other events.