[necovek]

I don't think aphantasia matters here.

I don't have a visual representation of the keyboard in my mind at all, but having touch typed (imperfectly) since high school, I can tell when I mistyped a key by feel too (eg. not looking at the output on the screen either, your muscle memory will let you know if any movement was awkard or unexpected).

FWIW, it's important to learn where the "corrective" (backspace, delete, cursor movement...) keys are on your keyboard while looking at the output: then you can easily push yourself to not look down on the keyboard while practicing.