Can you not read ur own source? All Pakistan did was cede the claim on the land China won from you. It doesnt say we gifted u any new land. In fact it says china ceded land to pakistan.
The
Sino-Pakistan Agreement (also known as the
Sino-Pakistan Frontier Agreement and
Sino-Pak Boundary Agreement) is a 1963 document between the governments of
Pakistan and
China establishing the border between those countries. It resulted in China ceding over 1,942 to 5,180 square kilometres (750 to 2,000 sq mi) to Pakistan[
citation needed] and Pakistan recognizing Chinese
sovereignty over hundreds of square kilometers of land in
Northern Kashmir and
Ladakh