We can see:
- José Ferreirós' review of C.K. Raju, Cultural Foundations of Mathematics: The Nature of Mathematical Proof and the Transmission of the Calculus from India to Europe in the 16th c. CE, in Philosophia Mathematica Volume 17, Issue 3:
In his interest to revise traditional historiography and oppose proofcentred mathematics, Raju devotes a lot of effort to questioning the existence
of Euclid and insisting that the text of the Elements originates at the
earliest in 370 CE (with Theon) or perhaps even in the tenth century. In
my opinion, this is useless and does not help advance the author’s main theses. For historical purposes, what is relevant is that Elements represents
a systematisation of a large portion of geometrical knowledge in the Greekspeaking world before the common era. (‘Euclid’ is simply the name of
its otherwise unknown author, whose dates—it is true—are dubious; incidentally,
an interesting question would be whether philologists find reason
to think that the text of Elements was written by different authors.) Raju
insists on the idea that Proclus’s views represent the original philosophy
of mathematics in the Elements (p. 25), and he overemphasizes the connections
between geometrical proof, Platonism, and Christian religion.
Regarding specifically the possibility that Euclid "the man" was a forgery is totally irrelevant: we know quite nothing about him, but we have "the book": Elements, and its value does not change if it was written by someone else (but in any case by some ancient Greek: we have testimonies...).
If the Elements has been "falsified", this fact does not change of a iota the meaning of its content: the theorems. It is not the same thing as saying that the Holy Bible has not been written by some ancient prophets and in reality is a late Hellenistic forgery.
Regarding in general the approach to history (and history of science as well), my humble opinion is that history is like any other science: conjectures and hypotheses are fundamental, and new insight and a fresh point of view can be useful and necessary, but there is a golden rule: all must be checked with facts.