Oddly, the error seems to either have been the poster's fault, or the editors caught it and changed it in the linked article.
An abstract of the actual paper states that the velocity used for the models was 20 km/s.
Simulations of asteroid impacts on water
My post to you was a reaction to the sometimes kneejerk skepticism of science that I have encountered here. Obviously I picked the wrong target. You were quite right to draw attention to the error in the article as posted.
This reminds me of the time I first used a university's mainframe computer to analyze data from a unusually complicated experiment. This was back in the days when punch cards were still vogue. After reading through reams and reams of computer print-out the data summary conluded with "meen" and standard deviation. Needles to say, I chucked the whole thing.