That was one thing I always found especially laughable- the suggestion that Musk was funding IHRA behind the scenes (outside of his other business arrangements with Cuttell) because they were such good buddies or he was a secret drag racing fan or something. Musk has never shown any interest in racing (or any other sport) and I believe has flatly dismissed the idea of Tesla as a company becoming involved in any sort of electric vehicle racing.
As for the IHRA & Cuttell overall, as one of the vocal doubters from very early on, it still sucks to be right about this.