If the philosophy of determinism is to be believed is it hypothetically possible to predict the future? is the lack of a successful future predicting machine or formula valid evidence against determinism?

Yes should the philosophy of determinism be blindly accepted than in fact predicting the future should be possible. however you would literally need to know every single variable ever so practically impossible. therefore the lack of a future predicting machine does not in fact disprove or weaken the arguement of determinism.