Great detective work! I can see there's 1 x 4.5 rating for a Languedoc-Roussillon with 1 x 5.0 for this category so averages his Languedoc-Roussillon category to 4.8. Every other thing is 5.0 and a lot of familiar VM wines (and a lot which have averages far below 5.0!).
Quite dodgy/disappointing.