Here's the key part

Jack Smith did not tell the Grand Jury about the Presidential Records Act or the Clinton Socks Case because he didn’t have to.

The crime cited in the indictment is "willful retainment of national defense information." It goes a bit beyond the Presidential Records Act.

They are specifically claiming a violation of the part bolded below in section e of this law, 18 U.S. Code § 793, which reads.

https://www.law.cornell.edu/uscode/text/18/793

(e)Whoever having unauthorized possession of, access to, or control over any document, writing, code book, signal book, sketch, photograph, photographic negative, blueprint, plan, map, model, instrument, appliance, or note relating to the national defense, or information relating to the national defense which information the possessor has reason to believe could be used to the injury of the United States or to the advantage of any foreign nation, willfully communicates, delivers, transmits or causes to be communicated, delivered, or transmitted, or attempts to communicate, deliver, transmit or cause to be communicated, delivered, or transmitted the same to any person not entitled to receive it, or willfully retains the same and fails to deliver it to the officer or employee of the United States entitled to receive it; or

His lawyers would have to show how those cases are exonerating.