Actually scholarship on the issue is going totally oppossed to this, the more we learn about the Quran, the less it seems to have anything to do with Mo in all but a few likely interpolated verses.
If this is the case, then how come there's this quote by Patricia Crone, saying that most or all of the Koran was most probably uttered by mo? I don't know much about Koranic scholarship today, but I assume that since Crone is known for being on the revisionist side, such a statement by her would mean that most scholars in the field also hold that view.
Everything else about Mohammed is more uncertain, but we can still say a fair amount with reasonable assurance. Most importantly, we can be reasonably sure that the Qur'an is a collection of utterances that he made in the belief that they had been revealed to him by God. The book may not preserve all the messages he claimed to have received, and he is not responsible for the arrangement in which we have them. They were collected after his death – how long after is controversial. But that he uttered all or most of them is difficult to doubt.
https://www.opendemocracy.net/faith-europe_islam/mohammed_3866.jsp