[Subject pronoun], not [Subject pronoun or Object Pronoun] + predicate

I know first pronoun is Subject, but what about second pronoun after "not"? Is it subject too like these two quotations? In first, not "he, not her"? In second, not "he, not me"?

Richard Buckham. Gospel Women: Studies of the Named Women in the Gospels, p. 1

1. The Female Voice in Ruth

André Brink’s novel The Wall of the Plague is written in the first person. The
novelist is a male Afrikaner, the Of the narrative is a "coloured" (mixed race)
South African woman. The thoroughgoing adoption Of a female character’s
perspective is intensified by vivid accounts even of distinctively female physical
experience. But in the concluding short section of the novel the voice changes.
The woman’s South African white male lover speaks, and in the last two pages
Of the work reveals that he, not she, has written the Story, as an attempt to
"imagine what it is like to be you." As he approaches the task of writing the nar-
rative the reader has just completed, he fears failure: "how can I, how dare I pre-
sume to form you from my rib? … To do justice to you an essential injustice is
required. That is the heart of my dilemma. I can never be you: yet in order to be
myself I must imagine what it is to be you."2 By this ingenious device of two lev-
els Of fictional authorship, the real author distances himself from the attempt

Andy Rotman. Thus Have I Seen: Visualizing Faith in Early Indian Buddhism, p. 79

"The householder’s son has profited and gained much," he said.
"He, not I, has satisfied the community of monks led by the Buddha
with food and drink. "69