Given how YOI started with Yuuri’s failure at the Grand Prix Final, it was almost too easy to discount the fact that Yuuri’s a professional skater - the top skater in Japan actually.
But there are all these clues in the background, even throughout the first episode, that Yuuri is an unreliable narrator when it comes to assessment of his own skills.
Just look at all the trophies that his family has proudly displayed in the common dining area!!!
In fact, he has so many, that there are evenmore trophies in storage in his room!
The series uses anchoring to introduce Yuuri as a subpar skater, to set the stage for the narrative of him getting stronger. But Yuuri has always been a damn fine skater and he has the trophies to prove it.