I got 3 min in and had to stop watching. No offense but I noticed at least a couple things done wrong. If you are going to put out how-to videos, be sure you know yourself how to do it right.
1st off your hole was not deep enough. You don’t want your tap root to curve like that. Second, that much fertilizer dropped on top of the roots will do more harm than good on a sapling. Also not sure if 50lbs of mulch is necessary on a sapling but I guess it doesn’t hurt? Basically I think you may want to learn a little more about tree planting before you show people how to do it. But I commend you for trying.