There were a number of reports and observations some years back of NYPD officers gaming overtime pay to pay themselves more, in some cases even claiming it while doing other jobs (like bouncer duty, private protection, etc).

No shade against the mayor.

Yeah so this would certainly be unacceptable, especially for NYC tax-payers struggling to get by I'm sure. My point is that the article leaves open room that the situation in SF isn't necessarily only due to unscrupulous behaviour. With that said, if there are other sources that indicate that this is happening in this case, I wouldn't be overly surprised either.