Then link to a real science site that confirms what you say. Even wiki called it speculation.
All such events are speculation. Scientific speculation.
But you seem to be missing the point. The fact that every ancient civilization has an account of a flood tells us that a major flood did occur. The meteor "speculation" provides the smoking gun.
You dismiss it because it destroys your argument. That's your only reason.
Some people would rather dismiss it because it lends credence to the bible and hints at part of the reason why at that point in time many people all over the world came to believe that there was an angry God up there somewhere with the ability to destroy everything as if people in all of their imagined glory were nothing and started to find ways to appease his wrath. Ritual sacrifice of farm animals and virgins, killing unbelievers, erecting monuments and building temples dedicated to his glory, etc.
A fairly sensible response given their limited knowledge of the universe and the fact that it actually happened..It would blow our minds if it happened today.