I mean that's still a loss no matter how you slice it. And it was one of the most predictable losses for Ash no matter how many people tried to use calculus and quantum physics to claim that Ash would win...
I sincerely question the idea that it was “ one of the most predictable losses for Ash “ considering that a vast majority of people did think Ash would win for perfectly legitimate reasons showcased by the show itself. That loss was one of, if the not the biggest surprise in the Pokémon anime; it was a day of mayhem in the Pokémon fandom for sure.
Hindsight is 20/20 and while there were some people during that time period who did predict Ash would lose, to castigate those saw Ash winning and imply that it was somehow clear all along that Ash would lose is pretty unfair assessment of how things went down to me.
I’m not sure if you were on the forum since you joined in 2019 or part of the greater Pokémon anime discourse during that point in time, but there was a sense of real inevitability in Ash finally winning a league based on the events that had transpired. Was it misplaced? Sure, one could say that, based on similarly legitimate reasons, but it was never hoping just for the sake of it.
I’m sure if you ask many XY fans or Pokémon anime fans in general outside of Serebii, that incident is still a sore spot for many.