Of course they did. There's this little thing called a code of conduct that police officers need to adhere to. And he broke it.
Consider the Time's justification;
“revealing confidential details about cases, some involving sex offences against children, that could be traced back to genuine prosecutions” as well as offering “advice to people who found themselves the subject of a police investigation.”
So what are his employers supposed to do here? Ignore it? He wasn't whistleblowing, where anonymity would be preserved.
If in the first case he did reveal personally identifiable information about people he dealt with in his job then that is out of order.
But what was so wrong about the offering advice to people subject to a police investigation? By that logic should we lock up all lawyers too?