The thing is, Joker being shown off at a Persona live concert is a gigantic marketing failure.
Here’s a hot take: 90% of all of Smash’s marketing isn’t done by Nintendo, it’s done by people recording themselves screaming at character reveals.
Very few Smash fans are even going to know PSL is going on. Then, when he suddenly gets shadowdropped onto the site without warning, those reaction videos suddenly become “Yooo. Joker is out. Wooow. So cool.” rather than “YOOOO HOLY **** JOKER IS OUT OH MY GOD”
The hype factor of Joker in Smash will die pretty much instantly.