Then we disagree on what is OPI
Here is the rule.
---
ARTICLE 8. a. During a down in which a legal forward pass crosses the neutral
zone, illegal contact by Team A and Team B players is prohibited from the
time the ball is snapped until it is touched by any player or an official (A.R.
7-3-8-II).
b. Offensive pass interference is contact by a Team A player beyond the
neutral zone that interferes with a Team B player during a legal forward
pass play in which the forward pass crosses the neutral zone. It is the
responsibility of the offensive player to avoid the opponents. It is not
offensive pass interference (A.R. 7-3-8-IV, V, X, XV and XVI):
1. When, after the snap, a Team A ineligible player immediately charges
and contacts an opponent at a point not more than one yard beyond
the neutral zone and maintains the contact for no more than three
yards beyond the neutral zone. (A.R. 7-3-10-II)
2. When two or more eligible players are making a simultaneous and
bona fide attempt to reach, catch or bat the pass. Eligible players of
either team have equal rights to the ball (A.R. 7-3-8-IX).
3. When the pass is in flight and two or more eligible players are in the
area where they might receive or intercept the pass and an offensive
player in that area impedes an opponent, and the pass is not catchable.
---
Sounds more like you disagree with the rule than with me.
Once the ball crossed the line of scrimmage, the contact was completely illegal. It's on the Michigan player to get around the defender to run his route.