The Borges piece actually left me with more questions than answers but that counts as reflection too.
The first thing that struck me was - why? Why write a review of a work that does not exist, by a person who does not exist? Was it a piece intended as a "joke" just to amuse Borges himself, or was the intention to hoodwink people into believing Menard and his version of Quixote? Was it doing this that amused Borges?
Was Borges just mocking those who believed what he wrote to be true, or those who take what they are told or read at face value? A modern parallel that came to mind was the start of their film Fargo, which states it is "Based On A True Story" even though it is not.
Was Borges being satirical by attacking critic's pretentiousness, or was in attacking the power critics have to decide what is valid art?
With regard to Digital Cultures, perhaps Borges was suggesting that the imitation or fake version of a work becomes "the thing" rather than the original. This could apply to remakes of films, cover versions of songs, and to digitally created and reproduced artworks. This questions the authorship of the original creative work.
Is Borges commenting on the context of the work being most important? Would Don Quixote still be regarded as a masterpiece if it was written "now"?
I still stand by everything I said. Barthes' "Death of the Author" says the same thing much better...