The whole reason why the press held off so long on projecting the winner in Pennsylvania is because even though Biden was making up ground, they wanted to be sure in their call before they made it precisely because of Trump and his cult screeching "FRAUD!" and running around like their hair was on fire.
Hell, most of them still haven't called Arizona (Save for Fox and the AP, IIRC) even though Biden is in the lead because they want to be sure that, again, they are confident in projecting the winner.
This is how the press has handled elections for decades now. There is nothing new about the process. The only thing new is having Trump standing on the sidelines screaming "FRAUD!" at the top of his lungs every time he loses something. I'm not kidding, either; when he lost the Iowa caucuses in 2016 to Ted Cruz, Trump declared he lost due to fraud and either needed to be declared the winner or have a new caucus held.
The press calls ultimately don't actually mean anything. But they are rarely wrong and their projections almost always end up being correct as to who the winner of a state is.
Knock it off with the concern trolling.