Nonsense. Every man has his price and I suspect President Duterte's is not that high, He probably has a big bank account in Macau and want's to make sure China keep filling it up.
If your suspicions were correct, Duterte's actions of the past two months would have been the exact opposite of what they have been.
Instead, Duterte is acting consistent with his statement that he has lived a good, long life, and is not afraid to do what is best for the people of the Philippines, even if it leads to his own demise.