that's because he was empty by then. falzes was in all it's length a downhill false flat that's why he still had something by the time they reached the final k.
but even that is a big improvement, in his 2011 level he wouldn't make it with the pack to the end on any stage of the giro with a climb in it nor would he finish inside the time limit on any mountain stage.
you should really see images from the 2011 volta, he suffered like a dog getting dropped all over the place while racing with over 40ºC and fighting every day to make the time cut. he eventually had to give up on the stage with the finish at the torre because he was dropped with something like 150k to go iirc.