I don't think it is. Pocky, at least, brings up the ideas of a culture and another country's fascination with that culture. Not a trope, but I don't think it gets the idea across better. I like People Sit on Chairs
because there's a lot of things you can
associate with that trope—just not literally them sitting down.
Anyway, I say cut. It's not a Useful Notes
either, I think. If there's a Useful Notes
for Japanese culture or otaku culture add a blurb, but otherwise it's not terribly more useful than literally just naming everything the Japanese eat.