You clearly don't understand the law of PPD/self defence.
If PPD is accepted it is a complete defence - rendering the killing lawful.
A lawful killing cannot be CH
Did you read the extract from the judge in the Oliveira case 1993 that I quoted earlier? PPD and self-defence are different so you can't just put them together as you seem to be doing.
I repeat it here: (my bold)
In S v De Oliviera 1993 (2) SACR 59 (A) on page 63 h – 64 a, Smalberger JA drew a clear distinction between private defence as a defence excluding unlawfulness, which is judged objectively, and “putative” or “supposed” private defence, which relates to the mental state of the accused when he states as follows:-
“From a juristic point of view the difference between these two defences is significant. A person who acts in private defence acts lawfully, provided his conduct satisfies the requirements laid down for such a defence and does not exceed its limits. The test for private defence is objective – would a reasonable man in the position of the accused have acted in the same way (S v Ntuli 1975 (1) SA 429 (A) at 436E). In putative private defence it is not lawfulness that is in issue but culpability (‘skuld’
