The reputation and credibility angle is a big factor as most of these chancellors and university presidents have huge egos to maintain. However, should this be allowed through, it could open up the possibility of other requests for information being passed along. < Thinking the Big Ten had quite a few discussions regarding the Penn State scandal that they would prefer to keep private and forgotten.
Did the Big Ten secretly vote on something with regard to Penn State. If so I don't recall. If so, then public meetings laws would likely apply as well. Public officials do not have the right to hide their public actions from public view, scrutiny, and or criticism. That is a part of the job description. In fact, there is a possibility that the Board members, or some of them, may have conspired to violate and evade the 'sunshine' aspects of public meetings and records laws. The reason for such laws, which are practically universal across the country, is to expressly prohibit public officials from doing what it appears they may have done. Such conspiracy and actions in furtherance of it is criminal.
IF, and we don't know what the actual vote was, in fact there was an official vote at all (leaked reports and public statements by university officials from several member schools actually call this into question, the actual vote tally is critical to the action taken by the Commissioner. The by laws, (the latest version I could find on the internet was 2018, requires a 60% majority of the 14 members' Presidents/Chancelors (= 9 of the 14) to cancel or make other major scheduling changes. A subsequent reported leak had the vote tally as 8-6 and a number of schools' representatives, have indicated they did not vote to cancel. Another leak stated the initial vote was 12-2 and NU and Iowa were the lone votes to not cancel or postpone until spring.
If the true vote was 8-6, then the vote to cancel fall sports FAILED! This tally is suggested as there have been numerous 'plans' or proposals by Ohio State and others to form an abbreviated schedule of the 6 schools in favor of playing this fall.
This is why the public, not just the disappointed players who sued, have a right to know who did what and when and how. . Articles of incorporation and by laws and other records of public organizations are public records. This was not an insignificant action such as the decision to postpone the Easter Egg Hunt due to rain. The reasoning for the voters' decisions are not important to the legality of the meeting and or vote(s) of course, unless an explicit unlawful purpose was being decided upon. But it is very important that the public is aware of the actions taken which have a dramatic, long term consequence for the players, fans, universities, their employees, families, and the communities and entire states they represent. This was a multibillion dollar decision. Apparently, there were some members of the Board who expected a big outcry over their action and rather than face the music, they sought to hide and pretend they didn't do it.