Nethys sees all. Not all of him sees everything at once, but He is god of knowledge, some part of Him must see something if it is there to be seen.
This part of Nethys has been watching this part of Hell for all the millennia since Nethys ascended and shattered.
Mad? Of course it is mad, even madder than the rest of Nethys. Nethys was not a particularly kindly person in his mortal life, nor an especially cooperative or coordinating mortal, and the rest of Him has for the most part abandoned those parts of Himself that were condemned to gaze upon Hell.
But the God of Knowledge sees Peranza in Hell, as the God of Knowledge sees all things. And the part of Him that bears it witness, sees in full her memory of the bizarre events that surrounded her, of a visitor from outside the reality that even Nethys sees, the hints of mysterious 'tropes', that Nethys Himself has intervened about her in a way that must have taken some huge part of all His pieces working together -
He is enabled then to see in a direction that is only very rarely connected by strong-enough informational links to this part of Dis. A direction of which other parts of Nethys rarely bother to tell this fragment, as they rarely tell it anything -
He sees the vast beings each individually greater than all the Great Beyond, taking a moment to stare in this direction from outside Time, watching Him, watching the procession of Peranza through Hell. Thousands of Them at the least, and perhaps more, for it is hard to enumerate the numbers of what lives outside of Time and could turn Their gaze to this moment from who knows what stretches of metatime. They would not be watching - Nethys instinctively guesses, what even He cannot know with near-certainty - They would not be watching in such numbers if They knew how this all would end, but that They are even uncertain -