No. There are people who cannot exist without the internal monologue, and if unusual circumstances interrupt that internal monologue they experience anxiety, dysfunction, and a rapidly intensifying irritation that they can't even articulate (because there's no monologue to allow them to describe it). They're generally very stupid, but the internal monologue tells them that they should have a high opinion of their own intelligence. It's unclear to me if they can even pretend to understand the concept of metacognition.

There is also a growing group of redditoids who believe that if you don't have an internal monologue you "have no soul".