Well to be fair, as written, the rule also doesn't specify what the In-Person Scout had for breakfast that day. "
Off-campus, in-person scouting of future opponents (in the same season) is prohibited"
See? So if said "
Off Campus In-person Scout" had hotcakes for breakfast it exonerates the Michigan football program from any wrong doing because the rule doesn't specify what was and wasn't permissible for breakfast.
To go a step further, the rule banning the use of electronic devices doesn't specify which type of electronic devices can be used to video the signs.
So if the "In-person Scout" used an iPhone then it's permissible because the rule doesn't specify that iPhones are prohibited.