Just a failure of research here. The payroll tax-holiday is a net plus to Social Security. Yes, there is lower revenue from payroll taxes, but all of it is made-up by the general taxpayer. To the extent that the holiday creates jobs, 1.3 million according to the article, it is a plus.
I thought that this article was going to deal with the absurd economic assumptions used by the Trustees. We are going into a fiscal cliff, and the Trustees are looking for an improving economy. The real interest rate assumptions haven't changed since before the financial crisis.
Fixing the fiscal crisis will bring SS a lot of problems, but this article seems to have missed all of them.