They don’t believe in Yoshke, Shabtai Zvi, Nosson mi’Aza, or any false messiahs. I don’t see why this is any worse than other sects. These kids’ parents decided that this is a good derech for them to be holding by.
Reform and Conservative dont belive in Yoshke or Shbtai Zvi either, Maybe they decided that was a good derech for them to hold by