I thought you read it all; it says right here that it wasn't a universal flood:
Compared to the flood accounts contained in Jewish scriptures, and indeed the various cultural beliefs of other peoples, the Qur'anic account, which was revealed by Allah and is the only divine text to have remained uncorrupted, stands as the most reliable of all these accounts. The Torah, a corrupted text, says that this flood was universal and covered the whole world. On the contrary, it appears from the relevant verses that the flood was a regional one and punished not the whole world but only the tribe that rejected the Prophet Nuh (as). Those who were destroyed in it were the people who rejected the message of the Prophet Nuh (as) and persisted in their denial. There is no indication in the Qur'an that the flood was universal. The verses on the subject read:
We sent Nuh to his people: "I am a clear warner to you. Worship none but Allah. I fear for you the punishment of a painful day." (Qur'an, 11:25-26)
But they denied him so We rescued him and those with him in the Ark. And We drowned the people who denied Our Signs. They were a blind people. (Qur'an, 7:64)
So We rescued him and those with him by mercy from Us, and We cut off the last remnant of those who denied Our Signs and were not believers. (Qur'an, 7:72)
http://miraclesofthequran.com/historical_06.html