I can tell you for a fact that he funded the study for himself. Dr. Irwig opened the study in March 2010 and the first US lawsuits were filed more than a year later in 2011. The media makes mistakes all the time so I'm not sure why you assume it is true because it was aired on CNN. Just a few weeks ago CNN falsely reported that the US Supreme Court ruled the health care reform act to be unconstitutional before revising it, which is an error far more significant than the one for this single study.
Any way, here is an article with a direct quote from Dr. Irwig in which he claims his interest in studying the topic came from his personal practice and that his study was not funded by any third-parties.
As noted above, in the end of his first article it is written Conflict of Interest: None. If there was any external funding, it would be required to be disclosed in his article or the potential consequences of his actions would far outweigh a few thousand dollars as was the case for Andrew Wakefield in the UK who lost his medical license.