It's not neurotypical to be able make their inner voice shut up on a whim. I realise later in life that plenty of folks have inner voices in every waking moment, from picking up a can of coke to wanting to sit down. If do those things, I just do by instinct without an inner monologue. But when I do get an inner voice, it's more like detached, if that makes sense. Or it is kinda like an interview where I am talking to another person. I tend to visualise my thoughts more than mentally verbalising it.

My anendophasia explains a lot why I can't relate when someone says about silencing their inner voices. I get a confuddled face, before, everytime someone talks about. I don't really get negative thoughts but when if I do, I imagine the thoughts flowing away. I've been doing that before I heard that therapist recommend this technique called "flowing river", imagining thoughts away like a river flowing away.