PPP has been very favorable to Biden this cycle. Anybody trying to act like this state is leaning one way or another is fooling themselves. I personally see Trump winning by Kemp margins, but this is a toss up if I’ve ever seen one.
In the end it is usually the pollster who gets most closely to being right on who the electorate is ends up with the most correct poll. Trump obviously wins re-election with an electorate like those of 2010 or 2014. For the last five Presidential elections, demographics of the electorate in the sense of who votes and who does not tell everything. Only rarely does the electoral result show the utter failure of a nominee to achieve credibility.
If this election hinges entirely upon generational characteristics (older voters about 5% more R than D dying off and younger ones about 20% more D than R supplanting them, then Trump loses. If the margin is bigger than that, than something has happened that suggests a Trump failure.