I don't know enough about what Manson thought to give an informed opinion. I didn't know he said he had 144,000 followers. I know that to be the number that the Jehovah's Witnesses use as the number of people who will inherit the earth. At least I think that is what they believe, not exactly sure what the 144,000 are supposed to be doing, but I do know that they use that number.
I found two things in the video to be funny. One was that they claim to be Christians, yet said that they can't take the time to worry about the next life. Every Christian knows that the only goal of this life is to live for the next. They said the exact opposite. Then it said that they weren't and couldn't be racist because they were black. But everything else said to kill whitey just because of his race. I'm not sure how bright these people are.