If you look at things in a vacuum “shooting woes on the road” your comments aren’t completely wrong, but at the same time it’s a pretty lazy take. I’m not sure you’d find a college team in America who shoots it better away from home than they do in their own building.
But facts are that IU has had some extremely good offensive performances on the road; Xavier, Iowa, Illinois who are all quality NCAA tournament caliber teams, and there’s a reason for it, neither of those teams are particularly good defensive teams, nor did they have guards who are overly physical. By contrast and with the exception of Minnesota who exclusively played zone, in games that IU has struggled to score/shoot the ball they've been met with good defensive opposition who can match our physicality and disrupt any kind of offensive flow by denying post entry and turning us over. Fortunately for IU, Michigan isn't one of those teams.
Simply put, Michigan is a very poor defensive team and even better for IU, they don't play a physical style of basketball that has made life tough at times for IU on the road this year. Sure, they have some decent size as well as athleticism/length at certain positions, but they don't have the personnel or defensive approach to really overwhelm Indiana Saturday. Hunter Dickinson cannot single cover TJD at the level he's been playing at the last month and they start a 5'11 170 lb true freshman PG who Galloway/JHS should easily be able to exploit.
I'm much more worried about them coming out and scoring in the high 80's than I am them limiting IU to 50 points.