I think it's NEUTRINO. The voicebank developer is M.Morise, who has a interest in AI synthesis (he made his own synthesizer, but hasn't done anything with it for a whole) and as far as I remember had something to do with AI Kiritan's development. The adviser is SHACHI who made NEUTRINO itself, which is a dead giveaway. Not too related but Caparo Ulala who's in charge of labeling (another giveaway that it's either SynthV or NEUTRINO) also worked on Kiritan and Itako's original UTAU voicebanks and is generally very competent, so she should be good.