I have been given screenshots of a letter which I transcribe below. My read is that this is an improvement on the letter from the PR folks, which did not specifically address the issue of right-wing targeting.
Dear History Department Graduate Students,
We want to acknowledge your concerns about recent developments. Please know we stand in firm support of our teaching assistants. We fully recognize, respect and encourage many of the innovative pedagogic methods designed to encourage the participation of marginalized students. We also deplore the ways that social media has been used to target those who seek to further this mission. While we cannot comment further at this time, we are cognizant of our responsibility to make all students feel welcome and included in our classrooms. We remain deeply committed to realizing these goals together.
We hope to have the chance to meet and hear your concerns in the coming weeks.
The document is signed by the Director of Graduate Studies for History, the Associate Dean of Graduate Studies, and the Chair of the Department of History.