I really don't agree with the statement. Leaving aside issues of basal metabolism I think type of calories eaten can and does have an effect on exercise. Whether we're motivated to exercise, whether we're likely to continue once we've started, whether we're likely to be up and about whether it's formal exercise or not. On the same calories, I can be sluggish or bouncing off the walls. I'm not talking about performance, it's possible if I were to do a carb up I'd end up increasing my maximum deadlift or something. But I might be less likely to want to work out in the first place.