Trafalgar had Trump ahead in Michigan last month also.
This is nice movement:
MI Sept 2020 Presidential Poll
Donald Trump 46.7%
Joe Biden 46.0%
Jo Jorgensen 2.1%
Someone Else 1.2%
Howie Hawkins 0.8%
Undecided 3.2%
To me, the absolute numbers in any poll are less important than the trend. Assuming their methodology is consistent, this shows a late break for Trump.