Kilian's "VK10K Challenge"

Seen a few cool youtube videos lately of people attempting Kilian's pretty crazy challenge, the vk10k

Your combined time of a vk (1000m of climbing) followed by a 10km flat time trial.

The only leaderboard I've seen (vk10k.com) shows Kilian's time is 53min39sec! That's mental. The other times on there are like 1h35min and almost 2 hours!

Kilians splits were a VK time of 29:57 and a 10km time of 29:42 (sub 3min/km!)

Anyone here attempted it?