I broke down the numbers across a few different threads. Here's one:
https://hachyderm.io/@mekkaokereke/113351037260387408
Short version, Black men didn't go more towards Trump. Black men went waaaay to the left of Biden, to the point of sitting out the election out of disgust.
Everyone depends on Black men voters, but no one really listens to Black men voters, so this very clear dynamic was completely missed.