California smog stations have a legal obligation to the State of California, depending on the county in which they operate, to provide smog inspections to all vehicles requiring emission testing.
You can advise the smog technician you are aware of this requirement, and demand a smog check, however we're not quite sure you'd want a disgruntled technician handling your vehicle.
We recommend you contact a SmogTips Certified smog station, advise them you found them through our website and that you've already contacted us regarding Porsche smog checks. They will be glad to help. If need be consider making an appointment with the smog station which satisfies both parties.