You can't tell by that little bit. It could have very easily been a poetic description of days of old.
Since we know there was no flood you are left with a few possibilities.
Jesus was a man and did not know any better.
This seems to me to be the best answer.
Jesus was the Son of God and was being poetic.
This to me seems to be the only reasonable theological explanation.
Jesus was the Son of God and was being dishonest. This seems to me to be totally unrealistic.
Noah was the son of Lamech. Lamech was the son of Methu'selah. Methu'selah was the son of Enoch. Enoch was the son of Jared. Jared was the son of Ma-hal'alel. Ma-hal'alel was the son of Kenan. Kenan was the son of Enosh. Enosh was the son of Seth. Seth was the son of Adam.
Peter was the chief apostle. Did Peter believe Noah was a real person?
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