You spent the past year lifting heavy, forcing your body to adapt to increasingly heavier loads, and by using that stimulus you improved your strength and (i'm assuming) built yourself some muscle. Lifting heavy will keep that muscle around.
Speaking from experience, the high rep sets and short rest periods in NROL FL can be so demanding that you may sometimes end up using a weight far lighter than they are capable of lifting for the prescribed reps. When this happens you are not lifting heavy enough to effectively preserve muscle.
For example, if Elton John is used to deadlifting 315 lbs for three reps, he should be able to lift something like 260 - 270 for eight reps. However, now he's throwing in not only a supersetted exercise but also the extra challenge posed by a miniscule 30 second rest period; he might find himself without the energy (or willpower) necessary to pull even 225 on the second and third sets. While this session will no doubt be a punishing metabolic workout, there isn't a sufficient stimulus to the muscles themselves.
So, in a nutshell, i don't think there's a serious risk of muscle loss as long as you eat enough protein and continue to challenge the muscles.
If your conditioning level forces you to use much lighter weights than your muscles could handle under less stressful conditions (but for the same number of reps), consider lifting heavy for low reps once a week, only using a few sets of the basic big lifts. This way the heavy stimulus remains and your body will be encouraged to hold onto that hard-earned muscle mass.
I'm not an expert, but that's what I would do in your situation. The NROL fat loss workouts are truly awesome, give them a try. Just keep an eye on your strength levels and eat right. Losing a tiny bit of muscle in the process is just about inevitable, but you will probably look and feel so much better that it won't bother you. Also, take solace in the fact that recovering lost muscle mass is easier than building new size because you've already made the neural adaptations.
- Peace
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