It'd be better if the courts could actually deal with the case now instead of in 1-5 years, but alas.
Not for government agencies. Data retention generally goes much longer than that, usually measured in years or decades, not days or weeks.
Documents are kept longer. But a court needs to think about the shortest possible retention time that any agency might have for any kind of evidence.
> This chart includes categories for how long video is kept if it does not contain evidence of a crime [emphasis added]
So yes, some things are short (I did write "usually" for a reason), but even your link doesn't claim that video of a killing would be deleted in 90 days. It's evidence, 90 days would be ridiculously short for retaining evidence.
Even for people who don't think the ICE agents committed a crime, the ICE agents and DHS have claimed that this was the outcome from actions by a "domestic terrorist" which certainly makes it evidence of a crime from their own perspective.
A future administration cold, but won't, choose to ignore the law about parsons just like this one is ignoring the law about murder and torture.
Or he could have the DOJ charge all of ICE, get the cases removed to federal court, then do an Eric Adams job on them. That'd be a sight to behold.