As a Backpacking MBC I do not count Philmont as completing the requirement. They didn't create the itinerary, they didn't create an emergency plan, they didn't create the menu and so forth. The most they could possible do on a Philmont Trek for this requirement is create a daily schedule and a budget for the trip but will miss some obvious valuable lessons if they used a trip they create on their own. I.E. the true cost of feeding a crew for 5 days and how to keep the cost low.