That was a temporary event in starlight. Even if you click on Arlot in the hero mode and look at the skin, you will see the text below “Temporary events”. If I'm not mistaken this was in 2021.
Where do you live, is there no MPL championship? If there is, it would be a good idea for you to participate. You have a lot of knowledge about the game.
Bro, could you do stream live? I think it would be cool to see your thoughtful gameplays on the go. Not that i dislike these recorded videos. And yeah, i think your gameplays are no short of perfect.