ok, finally got a chance to look at it in some detail, and here is the scoop:

let's see what the values are ?

    % defaults read com.apple.SoftwareUpdate

    {
        AvailableUpdatesNotificationCountKey = "-1";
        AvailableUpdatesNotificationProductKey = "MSU_UPDATE_24G90_patch_15.6.1_minor";
        MajorOSUserNotificationDate = "2032-12-31 23:22:47 +0000";
        UserNotificationDate = "2032-12-31 23:22:47 +0000";
    }

    % defaults write com.apple.SoftwareUpdate AvailableUpdatesNotificationCountKey -1
    % defaults write com.apple.SoftwareUpdate UserNotificationDate -date "2032-12-31 23:22:47 +0000"

with this, i don't see the nags just yet, but probably it is a bit early to conclude ?

Sorry I didn't see this earlier, but yes, that's the settings I was referring to.