I don't think the DeLorean would technically exist.

[The One Free Man]

If Doc Brown faded out of existence from the new timeline, then the DeLorean shouldn't exist either, right?

[glanni glæpur]

i think doc building the delorean is a fixed point in time in bttf sort of like doctor who

[Stigma]

引用自 Jack Foxtrot：

If Doc Brown faded out of existence from the new timeline, then the DeLorean shouldn't exist either, right?

Correct, because in this episode's alternate timeline Doc didn't build the time machine. Thus "time travel Marty" shouldn't exist either. And neither should the picture you can find in Citizen Brown's office in order to convince him you're telling the truth. What happens to pictures in the movies when the past/future is altered? The pictures get altered as well! But not here, simply for plot convenience..

The whole episode is simply a gigantic plothole which goes further and beyond any plotholes existing in the franchise already. Yes, the episode is admittedly cool, but it hinges on said plothole. And because the episode is cool, we're willing to overlook the wortst plothole ever.

引用自 Postal Dude：

i think doc building the delorean is a fixed point in time in bttf sort of like doctor who

No. The game clearly tells you that Doc never made the time machine in this chapter/alternate timeline. It's one of those paradoxes that should destroy the universe.