Wikipedia can never be used as an official credible source as anyone can modify it.that indian @magra is a bullshit merchant. if anything, Pakistan gained some territory from China. even wikipedia agrees.
Sino-Pakistan Agreement - Wikipedia
en.wikipedia.org
Even if I trust your wikipedia link, it clearly warns that the neutrality of the claim of territory gain is disputed.
We fought a war in 1962 and could not recover Aksai Chin. We never wilfully surrendered land like you. So much boast of a warrior race but meekly surrendered to Chinese.I'm always astonished by how much Indians do randi rona about land we exchanged with China 50 years ago. We barely heard a peep when they lost land in Ladakh. It's like the lives of those brave virat Jawans who gave their lives getting beaten up like ragdolls by Chinese soldiers didn't matter...