The judge said there is something dirty about it. The judge said you don't get to decide what to withhold and what is important. Withholding something is dirty in itself.
As much as ronburgundy loves to decree things with authoritative pronouncements, he is flat wrong.
Flat wrong in what sense? He said that the judge's determination was correct in that the prosecution shouldn't be the arbiter of what information is redundant.
He's also correct in stating that the information gleaned from Allen's second interview was essentially the same as the first. This isn't burying a witness, or hiding another person's fingerprints on a murder weapon.
The judge was rebuking the prosecutor for withholding evidence because he withheld evidence. The procedural violation doesn't change (nor is changed by) the quality of the evidence.