>There’s a lack of this inner thought which is an actual condition people have

I find this so hard to believe. Are these people even conscious? I can solve math equations, think about my life, write code... all without any inner voice, especially when I'm in a flow state. When I do have an inner voice, I would describe it more like talking to myself without actually mouthing words. But never, ever did I have no "inner thought" at all. Like, I'm always aware of myself and that I'm thinking.

The “mind’s eye” stuff you described very well, I think.