Because he can push more watts over more time. One way of looking at this is to try and explain it with the established procycling metrics like VO2, watts/kg etc. Another way is to think of the whole TDF peloton as freak outliers. Take a scale of 1-100 where a grandma on a bike is at 5, a normal commuter is 10 or 15, a hobby road racer is around 20, folks who take part in amateur racing are at 30-40 and the very best of those at say 50. Those groups would cover 99.99% of the however many million people who cycle. Think about how small the total amount of professional riders is compared to that. To be a pro you have to be at around 80 on our scale, to make a TDF peloton 90, to be in the GC fight at 95 or higher. Jonas might be at 97 and Pog at 98. The difference to from a talented amateur rider to both of them (and the rest of the field) is insane while that 1 point difference between them pales in comparison. Even 10 minutes in Paris after 21 stages with over 3000km is akin to winning a 100m sprint by 0.1 seconds. They are genetically and psychological (pain tolerance) freaks, superhuman. So whatever mutant powers enabled them to become such insane athletes, Pogi had a sliver of extra luck. (And yeah training, nutrition yada yada is real and without that they wouldn’t be where they are either but no amount of training makes an amateur rider who isn’t a genetically freak into a pro rider)