Employing the same procedure for the singlet-triplet defect localized excitation, both at the optimized ground state geometry and optimized excited state geometry, led to a NEVPT2-DMET value of 2.89 eV for the later case. This value at the optimized excited state geometry is in good agreement with experiment, and overestimates the experimental emission value of 2.4 eV by approximately 0.5 eV. Our results suggest the observed emission to be originating from a 3 T 1u to 1 A 1g transition, motivating deeper investigation in this direction.