It's really worth taking the time to watch it, as it goes really deep and makes it clear why revelation from God is the only way you can't know that you aren't a brain in a vat. Sye uses the analogy of a mansion with 1000 rooms, and 999 of them are the BIV scenario, and only 1 of the rooms is a normal room where the person is actually experiencing reality as it is.
The reality experienced by a real person and a BIV would be exactly the same. A BIV would look at his hands and say "I've got hands" but in reality they don't have hands and the hands they think they see would just be computer generated illusion.
You could say that you are 99.99% sure that you aren't a BIV, however, where did you get that percentage of certainty from? You've just made that figure up based on your feelings. Given the fact that the reality experienced by a person who is a BIV would be identical to that of what we consider normal reality you've got 0% certainty that you aren't a BIV. Without God you can't even be 1% certain that you are not a BIV, in the Matrix, or in some other illusory reality.
God enables us to know with certainty by revelation knowledge that we are not brains in vats, or in some kind of weird reality that is illusory, because if we were the Bible would not be true, and nothing could be true.
The critic might say that God could be deceiving us to make us think that reality was real, but actually that is just part of the deception. But God cannot lie or deceive. (See The Deceptive God Argument Refuted).
The fact that professed atheists and professed unbelievers cannot know they aren't brains in vats shows the absurdity of unbelief. If you can't know you aren't a brain in a vat you can't know anything. You can't know the true nature of truth or reality to any degree!
If you don't know that you aren't a brain in a vat, then you can't know that anything even exists outside of your own consciousness, as Negation of P admitted. He's not even sure if his own wife exists!
Everyone assumes that they are not a brain in a vat, but without God they can't account for knowing they are not, or knowing the true nature of reality for certain to any degree. This shows that everyone does know that God exists but they are suppressing the truth about God. (Romans 1). Professed unbelievers are willfully ignorant and deliberately forgetting God. (2 Peter 3:5).
Based on the certainty of God's existence and the truth of the Gospel I can echo the words of Paul in Acts 17 where he says that God "commands all people everywhere to repent. For he has set a day when he will judge the world with justice by the man he has appointed." That man is Jesus Christ, and he died as a sacrifice for your sins. If you have not yet repented and trusted Jesus, don't leave it too late.
P.S. This is one atheists response...
Common sense presupposes an ultimate standard of truth, and you can't get truth without God. It's not "common sense" to assert that there is no God - it's foolishness. In saying that something is "common sense" you are asserting the logical fallacy that truth is determined by majority opinion. While the majority is often right on simple issues, they can often be wrong too. If the majority of people in the world agreed that the Bible was true, would you then accept that it was true?