The supposed impact is merely a data point that could be used to interpret Earth impact periodicity. It can only contribute to our to our current collection of data. Defining it as evidence in support or against periodicity is premature.
I was saying that it is evidence that the dinosaur asteriod was not just a random asteroid. Some external force disturbed potential asteroids and shoved multiple ones into the inner solar system. That fits with Nemesis. But would fit with other theories as well.