Plateau de Beille was at the end of a harder stage that was raced much harder than previously. Agnès was climbed ~10 % faster than in 2004 and 2011 by the peloton. More vertical meters and greater energy expenditure than any previous PdB stage.OK, that seems reasonable.
Speaking of shorter stages btw, Has there been any analysis on these record times in terms of where they appear in a stage? It's of course no surprise if a rider at the end of a short stage will climb a hill faster than someone doing the same hill after a much longer and tougher stage.