There is one MAJOR problem to this study. It does not look at hypertrophy response at all. Cardio after weight training is a VERY BAD idea when looking to gain or retain lean mass. Immediately after training mTOR, the primary non-inuslin mediated hypertrophy response, is through the roof. Feeding during this time is critical for hypertrophy. The higher the GI carbs and the quicker the protein source the better. When cardio is performed after weight training AMPKinase levels raise. AMPKinase shuts down the mTOR pathway, greatly inhibiting the hypertrophic response. Not to mention that the longer you wait after weight training the less sensitive your muscles are to inuslin and glucose, further limiting the hypertrophy response.
If you must do cardio and weight training in the same day, I would highly recommend doing cardio 2 hours or more before lifting, or 6 hours or more after lifting.