Has Payroll Technology Changed That Much Since 2009?

One of the reasons John Boehner has said that his people opposed the 2 month extension of the tax cut is that the payroll processors would have problems with it. That makes we wonder about this:

Just under two years ago, House Republicans, including some of the party's more conservative members, were arguing that a two-month payroll tax holiday would "effectively stimulate" the economy.

So how is it that they would be able to process a two month payroll tax cut in 2009, but not in 2011? It appears as though the NPRC was just pushing some talking points for the House GOP.