In the first few days after the election, some pointed to partial results in Philly as evidence that Black voters had swung to Trump. Now we have the individual vote history and can say that almost certainly didn't happen.
The early results showed a lower overall turnout and better Trump performance than the final certified results. In the end, Trump outperformed his '16 share by 2.5 pts. Biden ran 1.1 pts behind Clinton. So, was this gap narrowed due to Black voters going for Trump? Probably not.
Now that we have individual vote history we can see how the electorate in '20 differed from '16: 9k fewer Dems voted in Philly than did in '16, while GOP turnout increased by almost 4k. The Dem vote share dropped by 1.4 pts (more than Biden's 1.1 pt lag behind Clinton).
So why did Dem turnout plummet in Philly? Youth voters. Their vote share declined by an astounding 3.2 pts. Far fewer voters under the age of 30 voted there than did in '16. The pandemic had shuttered the universities that account for a huge share of the youth population there. 
So what does this all mean? Once again, early election takes are often garbage, but also are quite sticky. Most Americans probably think that Biden underperformed Clinton in Philly because of an underperformance with Black voters. It's a narrative lacking evidence.
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