Well there is an argument here.....
My argument would be that your claim is false and based on nothing.....
Explain how if the primary source of fuel for LISS cardio is fatty acids we will be burning Muscle if we do cardio fasted.....
If I was eating 10,000 calories a day would I still be burning LBM if I was doing cardio fasted.....
We need to look at the bigger picture when it comes to cardio..... Too many people over think the whole thing....