I have two problems with this story.
First is its title. Walmart has consistently promoted, and benefited from, neofascist interventionism for quite a long time. Switching from one form of neofascism to another shifting the governments mode of intervention from slightly more indirect to slightly more direct is not selling out, and so describing it pays Walmarts past self an undeserved compliment.
Second, in any case the switch is not as recent as the phrase after years of strenuous opposition implies, since Walmart had already started pushing for greater government involvement in health care two and a half years ago. (CHT Peter Suderman.)