How would you apply a demand factor to a theatre that has electric powered seats. There are 125 seats. I don't know if they are heated or not or whether it only the positioning that is electrified. Haven't seen the spec yet. It never ceases to amaze me what the affluent people of this society come up with.
IMHO, the 'proof' is with the design professional who presents the details, specs, calcs, etc.
Plan review is on the submittals, specs, details, etc. When I have questions regarding calc compliance issues, an email, fax, or snail mail to the DP for clarifications, or details on any calcs leaves the job on hold.