technically, Fleck has every right to report other schools for tampering.
but I think this runs afoul of the old "unwritten rules." a lot of head coaches complain about tampering, but many of them do not take any direct action. it's just not how things are done.
because if you complain about School X, then School X may complain about you.
and as others have noted, the trick is proving it. I read the relevant section of the NCAA rulebook, and it had a full page of notes dealing with what type of evidence and what amount of evidence was needed to corroborate any report of tampering.
so if a coach is going to report tampering, they had better be prepared to back that up with solid evidence and/or testimony.