Which is such *** lol. That's just because they didn't have a real argument for the Tour being the biggest race in the world other than "it just is" which is true, so they called it the hardest one. Then, becuase the parcours is arguably the easiest or 2nd easiest one, they just had to make up some BS.
It really makes me think of the insane bias towards the PL a lot of English football fans have. "Can Messi do it at a cold rainy night at Stoke?"
At least this year, the Tour will have a stronger GC field, which I find crazy as if you're not Pogacar or Roglic, you should be going here to try and win as you've no chance of beating them. Someone like Vlasov, Mas, Woods, Quintana should be racing here and trying to win rather than competing to be best of the rest at the Tour.
