Didn't see anything "grossly" wrong with the riding in that video. The filtering is definitely illegal, but in the manner he was doing it, he kept things safe. Rider had great throttle control and kept a good amount of noise to let other traffic know he was there while at a standstill.
I'd say he was going a little too fast at times, but nothing "stupid." At some points in the video, it's very clear that he's given himself room to adjust for lane changes (you can see him do it twice, in the instance he passes on the left within the left lane, he shows that he could have just as easily done it in the right lane). Remember that if he's in the left lane and someone from the second lane chooses to change lanes, he's always able to move into either the left shoulder or the space left by the person changing lanes.