My Setupack.log is nothing like yours. Multiple instances of the following with different time stamps in close succession:
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::CRestorePCSettings Initializing...
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::CRestorePCSettings Initializing...
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::GetActionDescription - Settings Item being displayed: SystemSettings_Misc_ResetYourPCActionDescription, Return: 0
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::get_IsEnabled - Settings Item Enabled:1 for for SystemSettings_Misc_ResetYourPCActionDescription
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::GetActionDescription - Settings Item being displayed: SystemSettings_Misc_RollbackYourPC_PreviewBuildActionDescription, Return: 0
2018-07-18 11:35:33, Info SystemSettings::DataModel::CRestorePCSettings::get_IsEnabled - Settings Item Enabled:1 for for SystemSettings_Misc_RollbackYourPC_PreviewBuildActionDescription
2018-07-18 11:35:43, Info SystemSettings::DataModel::CRestorePCSettings::get_IsEnabled - Settings Item Enabled:1 for for SystemSettings_Misc_RollbackYourPC_PreviewBuildActionDescription
2018-07-18 11:35:44, Info SystemSettings::DataModel::CRestorePCSettings::Invoke - Settings Item Action Invoked for SystemSettings_Misc_RollbackYourPC_PreviewBuildActionDescription: hresult 0
2018-07-18 11:35:44, Info SystemSettings::AdminFlowUI::UninstallViewModel::UninstallViewModel Uninstall ( via Settings ) Initialized.
2018-07-18 11:35:44, Info SystemSettings::AdminFlowUI::UninstallViewModel::Initialize User is attempting to Uninstall, by clicking Get Started button
2018-07-18 11:35:44, Warning SystemSettings::AdminFlowUI::UninstallViewModel::Initialize UninstallGetInterface Failed with Error: 0x80070490
2018-07-18 11:35:51, Info SystemSettings::AdminFlowUI::UninstallViewModel::~UninstallViewModelUninstall ( via Settings ) Terminated.
My SP2 is the one I've always had, so the SP4 swap theory isn't valid. An SP4 would have been nice though.