Unless my memory fails me, isn't this essentially what Ralph Nadar said about being accused of playing spoiler in the 2000 election? That Bush or Gore were both bad for America and he was hastening the revolution?
I don't disagree with you, but the GOP's entire electoral strategy is contingent upon Americans voting against their own self-interest. So while they aren't making a specific strategic play here for Muslim Americans in MI, it's not any different than anything else they do to fool 70M rubes every four years.
Besides, it's not even about Trump flipping a Muslim vote, which obviously is ludicrous.* What if a substantial number of Muslim voters in Michigan choose to stay home in November?
* And even if that's ludicrous, the facts show that Trump picked up minorities from 2016 to 2020 (just not enough to offset lost support from whites). He also mopped up in South Florida, which seems pretty wild also. It's a broken record by now, but never underestimate the stupidity of the American voter.