As far as I remember , it was NOT announced at the beginning of the show that there WOULD BE 1 VETO power for the judges. Pls correct me if I'm wrong. In other shows they announce in the beginning .
This VETO power I suspect was not a part of the show format but a ploy to keep Isha on.
Veto power has been the format of JDJ since last season. It was used last season and it has been used this season as well.