I'd be skeptical of limiting glycogen replenishment for the following reasons:
1) If this is an effective training plan, why are none of the top athletes using it? There may be a few exceptions, but every top distance athlete I know of does glycogen replenishment during training. If limiting glycogen replenishment works, why haven't we seen the results?
2) Those same top athletes who consistently replenish their glycogen stores also consistently test high in efficiently burning fat. If glycogen replenishment inhibited fat metabolism, why don't we see that in these athletes?
3) A high fat burning rate is only one component of fitness. Without enough glycogen in your system, you can't work at a high intensity. If you can't train at a high intensity, it is hard to challenge the lactate system.
4) This sounds an awful lot like the old theory that working out on an empty stomach burns more fat. This may be true during the workout, but it ceases to be true when you factor in the total fat burned during the rest of the day after higher intesity exercise.