At least with the NYT exit polls, they included phone interviews to account for mail in voters. Here is a more systematic post-election analysis, based on a huge survey (100,000+ respondents), from Fox/Associated Press/U Chicago: https://www.foxnews.com/elections/2020/general-results/voter...

This one shows significantly lower Black vote for Trump than the Essence article (12% of men, 6% of women) but an even higher Latino vote (39% of men, 32% of women). Both sets of data show Trump losing support from white men slightly. (Which is consistent with pre-election polling.)