Huh? The right temp will display the right dew point from the right humidity. Not the wrong temp displaying the wrong dew point from the wrong humidity that is caused by a hot housing.
Again, the sensor uses temperature to get the humidity. It's actually marketed more as a humidity sensor. The temp reading is just a byproduct of sensing the humidity.
The sensor needs to know the temp before it can determine RH, so if the temp reading changes, so will the RH reading.