While DFT methods offer a good combination of accuracy and computational cost, it should be noted that the variation observed in the activation free energy with different functionals and solvation models is a well-known problem with DFT calculations. It thus becomes difficult to trust which result should be used. A remedy to alleviate the functional dependency observed in the calculated activation free energies has been suggested to use correlated ab initio electronic structure methods such as coupled cluster in multiscale modeling methods. Here, Mulholland and co-workers showed that the more than 13 kcal/mol difference in the activation free energy was removed by using projector-based embedding. However, for the present study, the experimental barrier is known, and the thermodynamic activation parameters are not very sensitive to small changes in the reaction free energy.