I couldn't watch the whole video, he sounds like someone who's read about stalking but never did it. I may be wrong, but that's how it struck me.
First thing he's showing me is horizontal lines on his coat, same with the hat and glasses (I wear them also so don't poo poo me on that). Horizontal in the forest doesn't move unless it's alive, that attracts attention from nervous game animals (and predators too).
If it isn't raining, generally, only eyes are reflective and prey animals lock on to that (and predators too).
Heel to toe? Never done it, toe down first feeling for twigs and whatnot and then putting the weight down, yep. You'll get a lot closer to game going toe first.
Like I said, I couldn't watch the whole mess but when I'm "still hunting" I probably only cover 100 yards in an hour, at best. Dry and crunchy yields a lot less than that. Imagine one step taking 20 seconds to get your foot down and your body solidly steady, then looking for every horizontal line to be the back of a deer (or a squirrel (or a round object, a rabbit)) in a 180 degree arc for a minute or two and then checking the ground for your next step. Rinse and repeat.
I've stalked a lot of game in my day, rabbits that let you get almost close enough to grab 'em up to a whitetail deer that's a coke fiend and spooking at it's own breath.