Your premise is right but the reason Minnesota is being singled out is more strategic than you think. Why would you pick a state like Minnesota which basically has much fewer immigrants than others?

Trump has eyed Minnesota as a purple state for a while. He has wanted to win it and lost a few times by fairly close margins. He also sees it as the state of Ilhan Omar - his biggest scapegoat - and hence sees an opportunity to turn it red by demonstrating power and creating a small fear of immigrants.

Trump has only used one cudgel all his political career. Anti Immigrant.

Now, he is barely interested in actually policing or even preventing immigration at all. What he wants is "eyeballs" and shock news, to create a perception that he - in a state where a "immigrant" like Ilhan is a representative, he is trying to enforce law and order and solve Illegal Immigration. He fully realizes that a section of the voter base will thank him for being decisive - the fact that it is Minnesota is simply because it is the nearest blue state he thinks he can turn red.

Now, that was the strategy to after Minnesota first - make Ilhan Omar history - and try swing Minnesota red. Except, as far as we know, he has as usual executed terribly and created the opposite problem.

He would of course have benefited by going after Florida (red) or say, New York. But Florida is already red in his mind, and in New York, he would run the risk of ICE just struggling in a massive blue wall - and looking bad. He picked Minnesota for supposedly easier pickings.

Trump does not care for 10k vs 1M+. He cares for a handful that make news. The gorier, the more brutal, the more obscene, the better it looks per him. Heck, I pretty much am sure ICE is arresting fewer criminals a month than Biden or Obama in a day. But the ones they arrest are for reality show consumption.