Note: The comparisons presented by iNaturalist regarding pine trees give very little imformation for identifying the different species ... e.g. number of needles per cluster, length of needles, colour and shape of cones, colour of needles, young growth, bark, etc, ... I would suggest that this needs attention if possible.
In this case, there are 3 needles of up to about 10-15 cm which fits the description of Pinus radiata by Lesley Henderson (2020) 'Invasive Alien Plants of South Africa', a very invasive species that is outcompeting local fynbos and needs to be removed from natural systems and outside of plantation areas which require permits that presumably also require escapees to be removed and destroyed by the permit holder. Old plantations and their escapees high up the mountains are being removed at great cost to society to prevent the degradation of our precious natural habitat.