This is purely conjecture, but I strongly suspect that since the GLP-1 drugs lower appetite in general, individuals on them typically do not end up eating high

This is purely conjecture, but I strongly suspect that since the GLP-1 drugs lower appetite in general, individuals on them typically do not end up eating high protein diets, where a protein-sparing low calorie diet would be highly beneficial and could likely maintain LBM and TDEE.