The report you linked to has been disputed by a lot of respected people: professors, the Michigan State Department, non-profits on fair elections, the former acting director of the U.S. Election Assistance Commission’s Voting System Testing and Certification Program[0], and even Krebs, Trump's former chief of the Department of Homeland Security's Cybersecurity and Infrastructure Security Agency[1]. The last affidavit written by the author of that report was also disproven and had entirely wrong numbers[2].
[0] https://www.factcheck.org/2020/12/audit-in-michigan-county-r... [1] https://www.freep.com/story/news/politics/elections/2020/12/... [2] https://www.reuters.com/article/uk-factcheck-michigan-voter-...