Apropos of nothing going on at the moment, I just wanted to shoot another hole in the bullet-riddled notion that Silkhorn's spirit travel was temporal, rather than spatial.
In chapter 5 of CALDE we learn that the year in the Whorl is 332. In the following chapter Auk encounters Tartaros, who tells him, "The faces we had as mortals have rotted to dust, and the voices we once possessed have been still for a thousand years."
The computer personality of the god in Mainframe knows that 1,000 years, not 332, have passed outside the ship since it was launched. I,000 years, roughly, was the span of time between Typhon and Severian. Silkhorn's spirit travel to Urth brought him to Sev's era, not Typhon's. Q.E.D., Silkhorn did not travel through time.
-Roy