Some laveyans believe that it IS the only satanism because all the other sects are bullshit because they are so flawed. Some laveyan satanists believe that the other sects are valid. It’s just a matter of opinion, my personal opinion is mixed, I think: yeah sure there are other sects but they are all bullshit. For example, Christianity is bullshit but it’s still there. That’s the same with what I think about theistic satanist’s.