No, Michigan didn't use an algorithm to manipulate 2020 election results - PolitiFact

... his analysis disregards registered voters who were added after that date — which was one month before Election Day — and the ballots they cast. Indeed, Frank acknowledges that his analysis of turnout and ballots cast counts only those who he says were registered by October. He refers to the other ballots as "unregistered ballots," and alleges that these were "injected" at the last minute. But voters in Michigan can register to vote right up through and on Election Day, and thousands took advantage of this right in the November 2020 election. Election officials check to make sure that every ballot cast belongs to a registered voter and that every voter only votes once...

https://www.politifact.com/factchecks/2021/apr/16/douglas-frank/no-evidence-michigan-used-algorithm-manipulate-ele/