For years, filler in anime tv series, as well as outside of anime, has been widely criticized for its unnecessary and boring plots, with a poor script and both a lack of narrative impact and character development. Naruto, especially Shippuden is the example, all his filler arcs did not concentrate due to his repetitive plots, characters for the most part not very charismatic, his humor, although he contributed something to the secondary characters to increase the emotional weight.
In My hero Academia most of the filler episodes used unnecessary and unfunny fan service with poorly written plots. With all that they are not going to create the best tv series in the world.
Instead this episode shows us how to make a filler chapter; an interesting plot, good character development and a good impact and narrative setting. The writers did very well, hopefully in the future of anime, especially Jujutsu Kaisen, it will have this level of writing in its possible filler episodes.