The weirdness of pronouns and linking verbs and pretty much everything in relation to context within the Japanese language makes it really hard to know anything other than "it makes Sneak Attack work more better". It would be idiotic for the ability to make Sneak Attack into Trick Attack, but hey, when just-retarded-enough-to-sort-glass-for-living is par for the course...
Anyway, I just replied to it by quoting the ability and effectively saying "Thanks for the food!" because I'm fat and that's the only Japanese phrase I actually know the moon-squiggles for. So I hope it's actually good!
