That's a lot of assumptions though.
You're assuming that instead of augmenting the current budget, the $2 billion will substitute the current cash on hand, it will not.
You're also assuming that the Saudis will give money to Pakistan, when the Saudis are also in a financial crisis of their own.
Finally, you're assuming that Chinese loans are better than IMF loans, fun fact, they aren't. Loans from China are apolitical, but they're also more expensive. IMF loans are more strict and goal oriented, but they're cheaper.