Checked out on a dozen STEM Universities I often encounter and found two not listed all. I assume this is because they were not in the top 300.
My own University was listed with a semester system which it has not had since about 1970.
Great idea, but I question its accuracy or completeness. When using data from here of importance to you, one might want to confirm with a second source.
Some Universities have recently picked up some generous donations. Data supplied here may be dated but not critical for most cases. A footnote identifies “data from 2015-2016 - 2016-2017 (top 300 results shown)”