Muhammad and the empires of faith is a good book, I quoted from it in a previous discussion iirc.
Because he’s discussing all 3 sources: Quran, epigraphy etc. and near contemporary non Muslim sources, what he says covers all 3.
He is certainly not saying the Quran was written up to 100 years later.
No it isn’t a fact and it is contested as, arguably, a non-Muslim source from 634 has him alive and leading the invasion of Palestine alongside other evidence that makes his date of death debatable
My source earlier showed the ridiculous number of dates given for his birth before orthodoxy was established. Just because something is held true by orthodox theology, doesn’t mean it is uncontested fact.
The earlier death is certainly theologically more convenient too.
It is true that 632 is the majority view, but like just about everything from this era, the evidence is ambiguous and very limited and the later date is increasingly popular among scholars. (See S Shoemaker - Death of a prophet for a book length discussion of this issue)
I think the historical context is very important, as did early Muslims as they significantly confected one.
That quote is emphasising how important it is to our understanding of the text, and how much we would have to reinterpret the text if we didn't use any of this
the sīrah-maghāzī tradition is problematic because it is such a noisy source—its version of history tends to drown out the other sources or else demand that they be read within the framework it provides. This applies especially to how one reads the Qurʾan, itself a source relatively devoid of historical narrative (which is not to say that it is uninterested in history, or that it lacks its own historical vision).4 For over a century, modern scholarship has seen early Muslim efforts to interpret and historicize the Qurʾan as the very fount of the sīrah-maghāzī traditions. In other words, although the traditions may appear to be historical narrative, this current in modern scholarship holds that such traditions are, in fact, fundamentally exegetical rather than historical in character.5 Whatever the drawbacks of the sīrah-maghāzī literature, the versions of history that its representative books offer is a rather cogent one and a useful heuristic, so its narratives and frameworks are inevitably the first narratives that one learns as a neophyte. Hence, the arc of this tradition’s narrative is often difficult (and, for some, impossible) to unlearn. Even today, modern scholars have scarcely begun to imagine what it would be like to read the Qurʾan without the aid of the exegetical and chronological framework of the sīrah-maghāzī tradition.