I think I have aphantasia and no inner monologue. Mind you, I can summon an inner voice to compose a sentence before saying it, but when I'm thinking about something being discussed and someone asks me what my thoughts are so far... I never have any idea what to say.
My mind is blank! It's always blank! There are never any discernable words or images in there to give you. If I need to communicate my thoughts, I have to spend significant amounts of time translating to words and choosing words before I can actually summarise what I was
thinking, which is much more nebulous to me than words or images.
My 'thoughts' are closer to a mouse cursor changed into an hourglass while waiting for a computation to finish than 'First we need to do <XYZ>, but to do <XYZ> we need <X>, <Y>, and <Z>. To get <X>, <Y>, and <Z>, we need to ...'
I find it really hard to operate in live/in-person discussions because of this. I physically end up just as silent and blank as my mind!