I don't know how to really read into it -- obviously Whitmer did very well! She basically tore through the suburbs and small cities in Michigan while doing extremely well in Detroit and Ann Arbor. And you can see, like I saw, in Leelanu, that she did well in traditional GOP strongholds that have a decent col+ population (it seems most of those counties that you can see that are blue near Leelanu have relatively higher col+ populations).
But if you look at the exit polls (I know, not exactly precise), you see patterns that are just really hard to replicate. Whitmer won every age group except 40-49 year olds, only lost men by 2 points, only lost whites by 6%, and got 43% of the non-col white vote. She even got 39% of non-col white men and lost non-col white women by only 3 points. Additionally, she won 7% of the Trump voters who voted in the midterms, as well as 6% of people who approve of Trump.
Some of that is replicatable, some of that is not. The MI SEN race does give me pause (though Stabenow literally did nothing), but I worry a lot less about Michigan than I do about Wisconsin. I think there's a reason why Priorities put it as Michigan -> Pennsylvania -> Wisconsin in terms of likelihood of going Dem.