No, your phrasing is not correct in my opinion. There is a
possibility that all Opera-users might know of Baam's existence. It's not like the Opera is a living being, watching the whole Tower and reporting to its user. If you don't use it or don't observe the right place at the right time, you won't get any information.
The wiki holds some information:
A little summary:
- There are 3 Opera's which are made by Tu Perie Tperie
- The people who possess an Opera: Jaina Repellista Zahard, Tu Perie Tperie, Lord Flux
- Tperie doesn't use her Opera. She uses the Eyes of God.
- it's unlikely that any more Opera's will be created (they require the highest purity Suspendium and many extremely rare materials
- In theory, the Opera extends the user’s Shinsoo field to infinity
- The communication function of the Opera and any other device connected to it cannot be stopped or jammed by other devices such as the Hell Train.
This was also the question I asked myself: how the hell did Repellista know about Baam entering the Tower before it even happened? Because that is what had to be happen, since there is no way in hell Yuri and Evan would have made it to the first floor in time otherwise. But you brought up an interesting point, kkck. It could be possibly to
"foresee" it with a Guide.
Or... another far-fetched theory: You can observe the outside world with an Opera or the Eyes of God?