Hmmm... the article cited usual practice: that pilots record times to the nearest 5 minutes and then gave the upper and lower bounds commensurate with the logged times. A flight of aircraft would normally land in close time and that three of the four aircraft recorded times that put the most likely time of landing between 15:12 and 15:13 -- right at the time of the 'blip' in temperature and noted that the temperature was 0.6°C lower just one minute later. At the very least, it's bad practice to rely on temperatures taken at heat islands. Obviously, this doesn't fit with your agenda but it is clear and transparent.
Link please. Without knowing all the details (including the co-ords of the station) you're just arguing from assertion.