Now that this data has been leaked, identities can be correlated with facial recognition, gait analysis, and other biometrics to conclusively identify the agents who committed crimes. Much of the video footage shows agents flagrantly breaking the law, abusing power, violating the rights of citizens and noncitizens alike.
Now that his leak has occurred, criminal ICE agents will be brought to justice for many of the crimes committed already, and the data will also inform the prosecution of crimes they will likely commit during the rest of Trump's term in office. Many of the crimes are violations of state law, so there is nothing the executive branch can do to stop the prosecutions.