[holdem2000]

Seems like your theoretical understanding is right, but if you start doing something like always calling with bluff catchers most OPPs will adapt pretty quickly... usually if you're going to keep playing this OPP it's better to just call with bluff catchers a lot (but not all) of the time so you continue to understand how they think in these situations. Our knowledge of our opponent might be something more like:

OPP bluffs too much in situation X while I employ a strategy of calling with bluff catchers 75% of the time, but OPP never bluffs while I call with bluff catchers 100% of the time.