The statement is based on the results released by the North Carolina Department of Revenue every year. Let's walk through the information again...
The audit is performed by the North Carolina Department of Revenue regarding the film spending showing the qualifying spending which received tax credits.
Here is the 2012 audit report -
http://dornc.com/publications/incentives/2013/01film_credits_12summary.pdf
Here is the 2013 audit report -
http://www.dornc.com/publications/incentives/2014/film_2013_summary_report.pdf
2014 is not out yet.
Also here is the summary from the North Carolina Commerce Department.
http://s3.amazonaws.com/site-docs/cj/film-impact.pdf
Here is a summary from the Under The Dome economic impact -
http://nchollywood.com/2014/10/10/under-the-dome-will-return-to-north-carolina-for-season-3/
"In 2013, audit reports by the North Carolina Department of Revenue show the series had a direct in-state spend of more $33.3 million while employing a total of 1500 individuals."
Here is a mid-2014 article from the News & Observer
New reports show effect of sweetened subsidy for film industry in NC
http://www.newsobserver.com/2014/04/30/3824068_new-reports-show-effect-of-sweetened.html?rh=1
At this point, it is obvious that 4000 jobs in North Carolina have been lost directly due to the elimination of the film tax credit. Those jobs averaged $53,000 per year in income. This represents a loss of $212,000,000 of taxable income in our state. With a 5.8% income tax rate this represents a loss of $12,296,000 of revenue to the state of North Carolina.
I won't mention that we are now also paying all of these people unemployment.