According to the following list and in line with the RTW rules linked above, JNB-SYD with SA code, but operated by QF is allowed for the :-: RTW.
The following (incomplete) list contains codeshare flights on non-star airlines that are allowed for RTWs according to the rules:
Code:
Codeshare flight No. operated by
BD 2651-2664 QR Qatar Airways
JK 9551-9552 BT Air Baltic
JK 9957-9958 OV Estonian Air
JP 9506-9962 AP Air One
LH 2405-2418 LG Luxair
LH 2741-2921 AP Air One
LH 5926-5935 A3 Aegan Airlines
LO 5155-5156 LY El Al
NH 6620-6621 QR Qatar Airways
OU 350-351 TK Turkish Airlines
OU 5538-5539 SN SN Brussels
OU 5605-5611 AP Air One
SA 7700-7701 QF Qantas
SA 8724-8725 MD Air Madagascar
SK 8400-8419 OV Estonian Air
SK 9600-9688 BT Air Baltic
TG 4534-4535 QR Qatar Airways
TG 4593-4596 LY El Al
TG 4653-4654 GF Gulf Air
TP 9100-9115 2B Aerocondor
Regional partners of one star airline that codeshare with other star airlines are not included in this list, but they are allowed for a RTW, too: Air Dolomiti is Regional Partner of Lufthansa but on routes to Vienna they have a codeshare only with OS.