Professional cyclists are just so incredibly strong and efficient at generating power. Vingegaard and Pogacar are putting out 6.8-7 watts/Kg for 20 minute mountain climb efforts in Tour de France.
In comparison, my 20 minute best is a laughable 3.3 watts/Kg. Not that I could be anywhere close to their performance but, feels bad that I can only get to less than 50%. It doesn’t matter that they are only about half my age.