No, it’s not fake. You can’t provide proof that it’s fake. You’re going off a political agenda. There’s a picture of hunter smoking a crack pipe!
Besides, the burden of proof applies here. "You can't prove it's not fake" is not a sensible approach. The burden is on the accuser to prove that the story is true, and the Post story does not do that.
Biden did pressure Ukraine to fire that prosecutor, that's not in dispute, he's on video saying he did it. What is in dispute is whether he did it out of a corrupt motivation to benefit his son and the business he was working for. That's not asserted in the article. It merely lays out the timeline of events -- granted, in an order which is meant to point the reader in a given direction. They even include a section with the Biden campaign's take on the prosecutor's firing.
When presented with the video of Biden admitting to it in his own words; he pressured to fire the prosecutor, but the prosecutor wasn’t investigating Burisma.
When shown that the prosecutor was actively investigating Burisma; well he pressured to get the prosecutor fired who was investigating Burisma, but it was in the national interest!
I’m not sure if there’s another round in the typical exchange. Best to just skip to the last phase to move the conversation forward.