It’s a “we’re really frum and we don’t want to wear short jackets and we like shtreimels and we speak Yiddish and so we’ll just unintentionally / unconsciously turn into chassidim” thing.
There are plenty of similar groups. Dushinsky became a ‘chassidus’, same for most of the other Yerushalmi groups. They don’t have any mesorah from the Besht.