As someone who struggles with executive functioning, I think this is a fantastic portrayal that could only work in the interactive medium of video games, and that's why it's so effective. One thing I will mention, though, regarding the line about deaf people not having inner monologues: they actually can! It may or may not be in the form of "hearing" a voice so to speak. It may be a visual mental image rather than an auditory one. It depends on the person, whether they're congenitally deaf or hard of hearing or lost their hearing later on and so on. This is probably a really small thing in the grand scheme of the game and might not even matter tbh, but I thought it was worth mentioning.