Yes, it’s quite clear that former Rebels were disenfranchised. One should not conflate being a rebel with being white but we see that conflation all too often. To answer the OP, no- “whites” were not disenfranchised, rebels were an a consequence of their rebellion. How is that either a problem or difficult to understand?I am reminded of a former members quote on this topic from a long time ago.
"If you wish to secede, be sure you succeed."
It infers there will be consequences if one fail at an attempted rebellion. Being disfranchised comes across as rather mild when compared to other rebellions, especially when one considers just how quickly Southern whites were welcomed back into the national political arena so soon after trying to destroy the nation from which they originally came.
Just an observation.