His twin seemed very different when I looked at his FB page (now gone). And interestingly, he posted the night they were arrested that "Liam has nothing to do with this band" (I am paraphrasing), about a picture on his wall. They look very different, not physically, but their demeanors. I definitely think that is Liam in the video.
Oh ok, I hadn't had a chance to see the brother's SM before it went private. Just assumed they were twins and had a close resemblance. I did hear there was a disturbing YouTube music video that Liam's brother was promoting. Is that the "band" you are referring to that Liam had nothing to do with?