You've got it backwards. There is a group of so called enviro nuts who are suing to stop the delisting of the wolves claiming that 7,300 or so wolves are needed. The group in this article is going to appeal the ruling if the ruling says congress doesn't have the right to delist wolves. They are fighting for the states right to manage their own wildlife without interference from the courts and radical enviro groups.
BTW, there is another article on FR right now about the group that is suing to over turn the delisting, don't have link but perhaps a search will do it for you.