On page 240, when setting the look and feel with the following command:
setLookAndFeel(RotaryKnobLookAndFeel::get());
I was setting it at the top of the constructor, which changed the label, but did not change the slider textbox text color. One of the AI tools suggested I set the slider look and feel separately with slider.setLookAndFeel(RotaryKnobLookAndFeel::get());, which fixed the issue, but I later realized I could call setLookAndFeel in the bottom of the constructor which would set it for all children.
If anybody was confused with this just letting them know!