Are text-to-speech/speech synthesis casts allowed on IMDb?

I've been wondering whether text-to-speech is allowed in casts. Some films, series, and games use speech synthesis instead of real actors, but I don't know if IMDb allows it or if it's only permitted with real actors, without AI or speech synthesis voices. There was a film example, WALL-E, where the steering robot AUTO was voiced using MacInTalk, Apple's speech synthesis program. Despite this, I'm still unsure if it's even allowed to use a computer-generated voice in a cast. So, my question is: can voices that aren't from real people be added to a cast? I just want to be sure for my future contributor.