It's alright…
I was also surprised that these maki for cats are "huge"—I thought they'd be about the same size as real ones.
My three cats seem to smell something from them, and so do I, although it's somehow different from the catnip I'm used to. They don't get as excited about them as they do with Aumüller toys, but every cat reacts differently to catnip or matatabi.
The sushis mostly just roll around, but even then I have to smile. If I join in, the cats play along too.