That isn't an indication that the Argyll's were close to Guvesne. It was normal for any aircraft sightings to be passed on to the British and French Signals HQs to their AA units and aircraft squadrons but it's much more common for the signals to come from Brigade or Divisional HQs than from individual units outside the AA organisation. To have records of a number of reports from this Argyll Gun is highly unusual and I'm intrigued. I'd think that this would have been an improvised AA gun but it was clearly well-enough respected to be allowed to send in reports in its own right.
Although 98th's Diary is always vague, it had changed its way of recording the place where the plane was sighted by this time. Initially, the place-name was recorded but, by early 1918, this had been replaced by Areas. Entries from the Argyll AA Gun are generally Area V but I have no idea where that is.
Any Argyll experts able to help?