"Snap switches shall be considered effectively grounded if either of the following conditions is met. (1) The switch is mounted with metal screws to a metal box or to a nonmetallic box with integral means for grounding devices."
I did point this sec out at the time. His response was that "mounted" meant tight and in direct contact. He's a good inspector and normally very fair so it just wasn't worth arguing. We went back and added the jumpers (on 9 switches) like he wanted.