How long would it take them to figure it out? If the entire issue is communication, would they be willing to talk with Siffrin anyways?

Would Siffrin accidentally be adding more power to the collective that the Vaugardians were adding by wishing at the Favor Tree each loop, or would Loop at least step in enough to tell them to cut it out?

...I could at least see them talking with Siffrin after that first loop with the Death Corridor, if they were just under the impression that Siffrin was taking that death a lot better than they remember taking it/was already a really good actor and was simply pretending it wasn't bothering them.

But after that...?