My brother was on this flight as a passenger and he said the approaches into Cape Town from both directions where totally smooth, no shear noticible in the cabin - just seconds before expected touchdown, the go around was initiated.
Information to passengers was sparse, except for a comment of tail- wind exceedance.
Refuelling in FABL took for ever as there was no way of pressure refuelling due to equipment limitations - they possibly also tankered fuel for the leg back to Paris as the AC seemed very heavy on the sector back to FACT.