Martinez should tell the district to shove it.
It sounds like a setup to me. The letter:
"According to your version of last Tuesday's events, my clients made a decision or took action concerning Superintendent Martinez's employment contract in violation of the Open Meeting Law. If your accusation is true, whatever 'action' that was taken is void. I have no reason to disagree and concur that whatever 'action' that was taken last Tuesday with regard to your client's contract is void pursuant to NRS 241.036.
"Accordingly, my clients respectfully ask that Superintendent Martinez resume his duties and responsibilities immediately."