It looks like he lied and used his privileged access to allow folks who were not authorized to enter the building into it. That is not freedom of speech, that is just violation of private property. The University has not really stopped protesters. During a recent budget meeting protesters lined the hall on both sides and chanted loudly against the proposed cuts while the meeting was in progress. Folks attending the meeting had to walk in between these shouting protesters to get to the meeting. The protesters held placards and chanted all kinds of things including “Rober J. Zimmer, Budget trimmer” ( come on they could have been more creative than that!! 
That almost seems like a banner for somebody who would be running for Congress)
The University allowed all of that. I thing Mr. Kissinger allowed people to trespass University property, deliberately and with pre-meditated intent. In my opinion it has nothing to do with free speech.