Thanks to everyone for the quick response! It looks like the majority say blow the whistle immediately.

However, I'm still a bit confused. The case play for 9.2.2c indicates the made basket should be cancelled. If the violation were whistled immediately, I don't see how a basket could have been scored. That's the root of my confusion. The other part that gets me is that all the violations/penalties seem to reference a player who is has obtained legal throw-in position, and in this case the player has not yet done that.