Rainbow created at Flood?

Genesis 9:13—”It is scientifically wrong to say that God created the rainbow only after the flood.”

There is no indication in this passage that the rainbow was created at Noah’s time—it simply was referred to as a reminder-sign that no more huge floods would come. God says in verse 13 .”.I have set my bow in the cloud, and it shall be a sign..” Critics might as well say that all the signs (‘ayah) from nature in the Qur’ān were only created at Muhammad’s (pbuh) time.