1. Except as otherwise provided in this section, if a declaratory judgment is entered under subsection 2 of NRS 30.040 during the lifetime of a decedent, declaring a document to be the valid will of the decedent, the validity of that will is not subject to challenge after the death of the decedent.
2. Nothing in this section shall be construed to:
(a) Prevent the appeal of a declaratory judgment entered pursuant to subsection 1; or
(b) Prohibit evidence that the will has been revoked or that the decedent executed a valid later will.