There are a couple ways to do an ollie.
You can use your legs only, just by lifting up your front foot, using the board like a diving board & bouncing the tail like a springboard.
Or you can rock your whole body forward then backward like described in the video.
The latter being easier when it's deep, heavy or just chopped up to shit.
I don't really think about it anymore, but when I watched the little vid there.
It looked like similar movements to this little ollie.
You have to ollie a little bit off drops with no kick, otherwise the nose drops first & you either eat shit or break your board. Possibly both.