Well, yes and sort of. Southeast Michigan (the Detroit and Ann Arbor area) is pretty much where immigrants from the South (Black and White) landed after the Civil War and into the early 20th century. I lived down there for years, and Confederate flags are rare to nonexistent in that part of the state.

My comment was based on where I live now in rural Western Michigan. We're not now, and we never have been industrial, and we didn't import workers from the South. In fact, more people leave this part of the state than come here. (The land isn't very suitable for agriculture, and logging and mining that boomed in the 19th century have died out in favor of parts of the U.S. more rich in natural resources.)

Nobody here has or values Southern culture. I have to buy grits online, and "red-eye gravy" might as well be a foreign language. Pretty much every cemetery in every old church yard features a corner with graves of dead Union soldiers.

The Confederate flags that are common here now only became common very recently. I only noticed in 2020 how much they were starting to proliferate . I think it's partly due to some radical anti-government militias (we're famous for them), which tend to be very racist too, got energized by their conspiracy-theory driven opposition to wearing masks, which our Democratic governor had asked, and in some cases, obliged people to do.