This is what the PGC had to say about the results of the doe mortality study.
To better understand hunter behavior and its influence on female harvest rates, we conducted a survey of Deer Management Assistance Program permit recipients on the Sproul and Tuscarora State Forests. Survey results indicated hunters may be less likely to harvest an antlerless deer wearing a radio collar. As a result, observed harvest rates of radio-collared females may not accurately reflect antlerless harvest rates
Also note that the study began in 2005 after the herd had been reduced and hunting pressure was lower and many hunters may have been reluctant to harvest a doe after seeing so few deer.