“中國的土地收回來了,就絕不會再失去” - Yes, so China will never get South Tibet back since we worry India may take it back later so “中國 will never 收回 South India which is 2-3 times bigger than Taiwan!
it is all about legimacy of CCP to China. hope it becomes more inclusive to other parties (meaning other Chinese with different thinking). Then the unification can become true.