I will be generous with Joe and allow for the possibility that that video might have been "altered" a little. But either way it is in sync with the rest of his appearance so if it turns out to be faked it makes little difference. Joe is lost in space.
Video's speed was altered and was much slower than actual. However, even in real time it shows how out of it he is.
I'm forced to admire some of you liberals, and your determination that this, lost, old man is your selection for President.
They should really drug test both Joe Biden and Donald Trump before the debates. But, will they ? More likely, they have him pumped up to be somehow coherent. And I am sure, they will have a teleprompter for Joe Biden to read or an ear piece dictating what he must say.