I don't have a subscription to Strava and i think i'm not able to see some relevant info. Looking at the segments, i notice a lot of different segments refer to the "top" of the climb 3k further down from where Pog and Ayuso actually ended up (for instance there is one segment called "last k col des rates"and "final sprint rates" but both are 3k from the point Pog and Ayuso "finished"). I can see that it's a "dead end" climb at the top, so riders have to backtrack the same way down like they climbed up. On the "main" segment / part of the climb (which people seem to refer to as the actual climb, just going by the segment names) their times aren't that extraordinary. On that part of the climb you have guys like Van Garderen, Ben Hermans, Cavagna etc... putting down faster times over 6.5k. But those names are absent on the overall segment or the top segment that Pog and Ayuso did. Again, i don't have a subscription and can only view the top 10 names per segment, so in theory it's possible those guys actually did do the same climb, but just completely tanked on the final part, i guess.
So, is it possible that the part to the top where they finished, is actually not a common part of the climb, or maybe restricted for certain periods of the year, or simply easy to miss or skip, or just hard to access? Like i said, it's a dead-end climb, maybe that part of the climb is commonly skipped by most riders? Because if that's the case, then it's hard to really judge the effort, considering they weren't exactly ripping the top times to shreds on the main part of the climb.
EDIT: looking at Ben Hermans' ride, he did actually skip the final part of the climb. Same goes for Van Garderen, Cavagna and the rest of the guys in the top 10 of the "main part" of the climb. None of them did the final part where Pog and Ayuso set the best time.