make no mistake, total withdrawal stands for accepting india's 3,500-km long border which means vacating aksai chin region
while
3,500-km means aksai chin as part of india,
china says the border length is only
2000-km as china considers aksai chin as part of china. interestingly, the former indian government claimed the border to be
3,488-km long whereas the present indian government claims it is
3,500-km long and that means more lands claimed if one goes technically.
read more about it here
Officials dismiss China's Kashmir border claims - The Hindu