So far this season Irrati has refereed seven Serie A games; he may also have had the occasional Serie B appointment. For purposes of comparison Massa has refereed 12 Serie A matches, Orsato, Maresca, Chiffi and two non-FIFA referees, Rapuano and Marinelli eleven each, Doveri and Mariani ten each. Given that Irrati is on the FIFA list as a VMO only, one might expect him to be given a lot of VAR appointments, and he also receives a substantial number of international VAR appointments.
One FIFA referee who does appear to be rarely seen is Marco Guida. Unfortunately he isn't on the list whence I took the statistics quoted above, and thus I don't know how many Serie A appointment he has had this season, but it is my distinct impression that it is fewer then Irrati.