Perhaps this was answered elsewhere in the thread - what is the actual injury here you would like ArbCom to redress? The disclosure of your IP information to a checkuser? Shouldn't it be assumed by all regular users, including administrators, that IP information submitted voluntarily to the Wikimedia Foundation (by editing) is available under the tenets of the checkuser policy? That policy allows checkusers some discretion on whether a check is justified or not (appropriately), but prohibits the release of private information. Was any private information released by Lar? If so, I haven't seen it mentioned.
Nathan