"to comment on personnel matters" means expressing one's opinions or giving one's thoughts about issues related to employees or staff within an organization. Full definition
A campus spokesperson would only say that the college «does not comment on personnel matters.» (thealt.com)
A Kushner Companies spokesman asked about Rapfogel's departure said that «as a matter of policy we don't generally comment on personnel matters.» (nydailynews.com)
BOE Executive Director Michael Ryan said «we don't comment on personnel matters» when asked why Canizio has yet to be reprimanded. (nypost.com)