Precisely. In AR you cannot fully expunge any records, but some records are eligible to be sealed - but you have to petition to seal them. The presumption is that they are public unless a petition to seal them has been granted. There is no automatic seal.
Reading all the exceptions in the law says that Duggar didn’t fit any of them. The family of one of the victims, however, did have a legitimate interest in having the identity of their child protected.