Not sure that report is saying what you or the Independent Sentinel hoped it did. From the actual report:
In addition to the foregoing incidents of serious offenses, for the first time, the CRDC required schools to report on school-related shootings and school-related homicides. Nearly 230 schools (0.2 percent of all schools) reported at least 1 incident involving a school-related shooting, and over 100 schools (0.1 percent of all schools) reported a school-related homicide involving a student, faculty member, or staff member. About 1 out of every 100,000 students was enrolled in a school that reported a school-related shooting or school-related homicide during the 2015–16 school year.
So from what I’m seeing, 230 schools reported at least one school related shooting, and over 100 schools reported a school related homicide. during the 2015-2016 school year. In other words, 230 incidents involving firearms, and 100 homicides (that may or may not have involved a gun). Unless you can point to something I’m missing directly from the report itself, there’s nothing there about reported shootings that did not actually occur.