Even if thats not a bug he's also in great plates as a rare drop. A balance for anyone who would whine about getting him for free.

it was covered more in the mess that was discord the initial hours after the first servers came back from maintenance. Such a mess. Tsuki was updated as per constant requests, fireworks was intended to be 45 frags it was a mis-communication that led to it being wrongly posted as 80x (doesn't answer why a useless nin got the semi meta treatment like AOG konan and a few others which were also 45x).

So it wasn't actually a modification atleast for the EN servers but a typo that was addressed a tad late after hype had already grown. It's not unusual for an occasional partial nin in fireworks.