A computational phonon breakdown of all phonon modes at T > T s was previously predicted using AIMD and taken as a signature of the superionic phase . The diffusive regime, however, could not be simulated for T < T s due to the limited simulation timescale, and it was unclear whether the computational phonon breakdown was a consequence of Li + ions being mobile on the simulation timescale, or of the superionic transition occurring at T s . We now have the opportunity to reassess our conclusions using MLFF-based simulations. Within the timescales that are achievable by our MLFF, we are able to simulate the diffusive regime for temperatures as low as 450 K.