Fantastic vid, that is basically perfect modern hook sweep from start to finish. Exactly the approach I use.
The details that make it modern (a lot of this comes from Terere)
Jamming that wrist under the guy, rather than clasping the elbow to you.
Free foot under the butt and driving on the floor with toes down, rather than both feet jammed in a "diamond" between the opponent's knees (a terrible flaw that destroys many an aspiring butterfly player).
Head jammed tight to your opponent's chest.
Elbow inside the knee
Above all, hook NEVER extends.
The sweep barely resembles the classic hook sweep, but I swear there is some irresistable impulse for BJJers to grab the elbow, try to pull their opponent directly on top of them, and then try to kick them over by extending the leg. It gives me sympathy for my judo teacher, because I can see how we are all trying to do the same thing with so many judo throws.
One last point, notice how the hook sweep position is virtually identical to the modern half guard position, where the knee is very high, blocking the shoulder, supported by the elbow inside, and the head is deep inside. In fact the body position is almost identical for both, and it is very easy to switch between modern half guard and modern hook sweep, which I do all the time. They are fundamentally very similar positions that have almost merged in the ATOS style game. The guy above asks for entries ... one easy entry is from modern half guard, you simply hook the "shield" leg into the thigh, bring your half guard foot out and to the floor, and then sweep.