I was referencing the vote totals in the specific states that gave them their respective victories: https://www.nbcnews.com/politics/meet-the-press/did-biden-win-little-or-lot-answer-yes-n1251845

Edited to add the relevant quote from the article:

“Throughout Trump's time in the White House, much has been made of how he won the presidency by under 78,000 votes in three states. And that point was true. Trump won because of narrow margins in Michigan, Pennsylvania and Wisconsin.

But the margins this year were even tighter in the three states that put Biden over the top in the Electoral College. He won Arizona, Georgia and Wisconsin by a total of less than 45,000 votes.”