Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
KO mouse pathology may not predict clinical VLCAD deficiency; triheptanoin stabilized but did not significantly improve cardiac function
“Thus, the progressive pathology observed in KO mice fed long-chain triglyceride and MCT diet may not be predictive of the clinical VLCAD enzyme deficiency. Although triheptanoin diet did not significantly improve cardiac function in mice”