Not surprised honestly. I actually wouldn't be surprised if it's some backward ass propaganda (not really, but it's way too frequent). The amount of Isekai, transmigration, or back in time stories I've read where the mc ONLY makes Asian, specifically Japanese foodstuff and the entire world loves it is extremely cringy. Let alone when a foreigner is in modern Japan.
Hell, I read a WN where royalty in the deserts that have never even eaten fish before try raw sushi and immediately love it. Not saying one or two wouldn' like it, but literally everyone from the children to the old-timers praised it as holy food, lmao.