In the video presentation below Dr. Flowers unpacks the various theories regarding the fate of the unevangelized while debunking the idea that this is a black and white divide between Calvinistic and non-Calvinistic scholars. In other words, there are even Calvinistic scholars (and confessional statements) that take a more inclusivistic approach regarding those who are unable to hear the specific news about Jesus. The slides for the presentation are also provided in the link below the video.
More on this topic is discussed here: