Technically he's from the original timeline where rin summoned a different archer and Shiro failed to complete the fate route I think it's hinted he tried again and that's ubw but I'm not exactly sure God the EFAP reference at the end it's so nonsensical that only people who've seen efap get it
Yeah all we know about archers route was that it was extremely similar to the fate route but he didn't save saber from her ideals in the end We dont know who rin summoned there's not a lot we do know about this timeline
First of all: I just loved the many many many call backs to previous dialogue pieces. Now to FGO: not playing FGO doesn't man you can't keep up with the story (it is after all to a big degree a VN). Also, to me Septem is the worst and Agartha the second worst, but over all almost all parts of the main story starting with Camelot are good to amazing (excerpt for Agartha and LB 2 was also just about as good as Okeanos to me).