I am not sure if this was posted already, but OP did not post everything from the news he/she linked, and here is the last few but important paragraphs:
So it looks more like a poor organization issue, rather than on purpose.
However, I am quite skeptical about the Chinese delegation member story, as it sounds too unprofessional and rude(however irritated the delegation member could be) and most importantly it is hearsay, so it is more likely invented by the Indian newspaper.
Suddenly, after the retreat, the South African foreign minister wanted Singh to meet Zuma quickly for 15-20 minutes. By then, the Indians were livid at the lack of care for protocol, and simply refused to comply at such short notice. Singh needed a half-an-hour breather and that was not acceptable to the South African side.
The Indian delegation was then focused on the Xi meeting, for which the senior officials wanted Singh rested and prepared. At Brazil's request, since Rousseff was to leave the same night, India swapped slots for the meeting with Xi. As a result, the meeting eventually happened at 9 pm — a good four hours off schedule.
India was, however, not the only delegation frustrated by the poor time-keeping. At one stage, an irritated Chinese delegation member is learnt to have told the South Africans that the first gift from Beijing to them has to be a good Chinese watch.
So it looks more like a poor organization issue, rather than on purpose.
However, I am quite skeptical about the Chinese delegation member story, as it sounds too unprofessional and rude(however irritated the delegation member could be) and most importantly it is hearsay, so it is more likely invented by the Indian newspaper.