So, in a nutshell:
1) Nairo won here in 2013 with an ascent time of 34m19s. He smashed his own time by over a minute in 2019 when he arrived with Yates, Martin and Bernal (33m10s). Today, he put another 30 sec into his younger self, but that was only good enough for 11th place, 36 sec behind Yates.
2) Valverde was second to the line in 2013 with 34m26s (give or take). Today, 8 years later and in his forties, he was 19 sec slower than Yates, that is, 32m27s, but still a full two minutes faster than his former self (who, let's not forget, was 1st in Vuelta Andalucía, 3rd in La Vuelta (taking the green jersey), 3rd in the Worlds and 3rd in UCI WT rankings)
3) in 2019, Yates (and Co.) crushed the all-time record for this ascent. Today, he put just over a minute into his own time and still looked fresh as a daisy at the line.
Everyone can draw their own conclusions, I guess...