Hello,
your report probably shows situation without atc at that time (vatsim) so most of users use this call to better push traffic to be effective, especially to that are waiting on h/p ready for t/o and don’t report any intentions (frequent problem). Call of 5 nm final simply give attention to all at that vicinity. I think that is not relevant what aircraft passed at that time, with call of 5nm final is simply wrong do t/o because some problems with after t/o turbulence and maybe other problem to landing aircraft is possible. In other case landing aircraft can report also …passing OM… what is ok to determine where it is but number represented nm distance to t/h is better. With call of final with ils app is some habit because also with other types of approaches like vor/dme or rnav the final track is reported. I do reports with ils app without final, only with nm distance, I see this more correct.