No.
We say that the "social contract" is an allegory for the transition from state of nature to civil society, and not an actual physical signed contract. Anyone who tries to say it is an actual contract is, from our point of view, in the same category of literalism with relation to mythology as creationists are.
Also, we view the social contract as between the individuals and society, not between the individuals and government or between society and government. The government is not a "signator" of the social contract. Instead, now that (within the allegory) the social contract exists and society exists, society hires government as the agent of enforcement of the social contract. Given this perspective, it is now extremely apparent that the government can also violate the social contract.
Saying that the government can violate the social contract is a heresy to conservoprogressives.
One side supports personal isolationism for everybody.
Only from the perspective of the two mistakes you made. That accusation of isolationism only makes sense if one thinks the social contract is a real contract, and that accusation only makes sense if one thinks the government is a party to the contract.
Both sides appear blind to the necessity for binding universal social contracts guaranteeing human rights, societal continuity, and environmental responsibility.
Now you need to look at what are the terms of the allegorical contract. In the state of nature, man had the freedoms to kill, enslave, rob, etc. The social contract was "if you don't kill, enslave, rob, etc. me, I won't kill, enslave, rob, etc., you." As a result of giving up the freedom to kill, enslave, and rob, the people gained the right to life, liberty, and property.
There are those who try to invoke "social contract" when they want the government to take from some to give to others. They don't realize they are undermining their own argument.
In short - the social contract belongs to libertarians, not to conservoprogressives.