No, they are saying it filters out some portion of the defendants. The article also says they carry out a fresh review of the case, and:

"The ASA shall confirm that no other probative forensic testing can be conducted and that no other witnesses can be identified and interviewed," the protocol reads. "At the end of this review, if both the ASA and supervising ASA(s) either no longer believe there exists a moral certainty of the defendant's guilt or believe there no longer exists a reasonable likelihood of conviction, then the case shall be dismissed without prejudice."

So, basically: The defendant asserts they're innocent and are prepared to take a polygraph and there is insufficient evidence or no real prospect of prosecution anyway.