Why not? Do you have Scriptural reference where he drank at the wedding.
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Don’t need a scriptural reference that he drank at the wedding in order to know that Jesus could not sign the agreement.
Read the last sentence of rule #4, quoted here for ease: “Neither will I promote or encourage the use of alcohol.”
John 2 makes it pretty clear that Jesus intended the wine to be consumed, seeing as He instructed the servant to take it to the ruler of the feast.
Please don’t get me wrong, if school A or denomination B wants to establish rules of behavior, fine. One can make an informed choice to work/worship there or not.