I'm not sure I have much, if any, heartburn with the concepts discussed in the story. I was much more afraid that I was going to read that LEAs were trying to put brakes on the "public policy commenting" issue that protects public employees who write letters to the editor/blog about screwups within their own agency.
As for the "advice" given - do not post anything to the internet that would bring discredit on you or your agency? I read that more as a different way of saying "Don't be a jerk" than "Just don't brag on line about being a jerk". Maybe that's because I have a deep and abiding faith that the jerks out there will not follow the "Don't brag on line" advice no matter how often it is repeated. It is as if there is an inate drive to document the extent of their jerkitude, and I'm eternally grateful for that.