The figures from the study actually suggest otherwise. The reduction from 2008 to 2009 was about 900 ER visits. In 2010 the reduction was around 500. It could be argued that the legislation slowed the reduction by about half.
You were probably able to do that analysis in just a couple minutes. I wish there were someone in the media or the legislature capable of pointing out the same. Unfortunately, most people will believe this baloney and it only invites the nannies to up their game.