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I think I understand now 
My impression is that the difference pre-01 that was harmonised is that France used fixed model years (July-June) which weren't used in other countries. Generally, outwith France marques called the new MY whenever they made changes. (cf the Range Rover: http://www.range-rover-classic.com/Home/land-rover-brochures/range-rover-1970-s where new MYs didn't come at a consistent time).
So the conclusion is that (for IMCDB purposes at least) this rule applies only to French cars? To illustrate, this Jaguar in France: http://www.imcdb.org/vehicle_669804-Jaguar-XF-X250-2012.html (with what Jaguar describes as the 2012 facelift but available from early on in 2011) is 2012MY but this Peugeot in the UK: http://www.imcdb.org/vehicle_782643-Peugeot-508-2014.html (with the facelift introduced in September 2014) is listed by calender year? That seems logical enough.
My impression is that the difference pre-01 that was harmonised is that France used fixed model years (July-June) which weren't used in other countries. Generally, outwith France marques called the new MY whenever they made changes. (cf the Range Rover: http://www.range-rover-classic.com/Home/land-rover-brochures/range-rover-1970-s where new MYs didn't come at a consistent time).
In a nutshell: please read "cars made in France", not "cars sold in France" in the very first post of this other thread.
So the conclusion is that (for IMCDB purposes at least) this rule applies only to French cars? To illustrate, this Jaguar in France: http://www.imcdb.org/vehicle_669804-Jaguar-XF-X250-2012.html (with what Jaguar describes as the 2012 facelift but available from early on in 2011) is 2012MY but this Peugeot in the UK: http://www.imcdb.org/vehicle_782643-Peugeot-508-2014.html (with the facelift introduced in September 2014) is listed by calender year? That seems logical enough.