His argument makes sense in a way I told you i.e. Jorgenson absolutely killing the bottom third of Plateau de Beille clearly affected Remco more compared to Pog so it makes sense to count the whole climb in this case. As for your general remark, it's quite likely that Remco is close to 10''/km behind Pogacar indeed (during last Lombardy it was nearly 9''/km on Ganda after only a moderate pace on previous climbs).
It doesnt because you will have a similar scenario next year. UAE will put a hard pace before Pogacar's attack. So you compare similar scenarios. Answering your point, if you looked to the whole climb, do you think Pogacar was just 18" better than Remco on Galibier? This depends a lot from when Pogacar attacks. Counting when Pogacar attacks is way more reliable to assess their levels.
Just for curiosity, would you look to results in a MTT to assess the difference between riders in road stages? Of course not, it's stupid. Roglic is a prime example of that.
Next year, the Tour will have the UAE train putting a hard pace all day in the mountains. The only GT we saw a peak Remco against a peak Pogacar is the 2024 TdF. This is why I took time differences from that GT. And it's good for Remco I only took the 2024 TdF as an example. If I saw the time gaps (s/km) between Remco and Pogacar in all mountain stages they raced together, the scenario would be even darker for Remco.
In fact history shows 10"/km is a great result for Remco. And this is pure evidence, facts are there to see.
But let's move on. We don't need to agree.