Yeah I also had the same wording in my offer letter about the stipends. But I'm more concerned about overall research funding/ability of the school to retain professors because the Illinois state government is notorious for budget issues. That article I posted mentioned how some of the big Midwestern public schools are having professors taking higher paying positions at other schools which have more money to spend from endowments, etc. For example UW Madison had two well known chem/biochem professors recently take positions at MIT for salary reasons. I don't think it's a major issue, but it's something which I hadn't been seeing getting discussed on the forum.
And cool, hope to see you there.