Chinese streaming platform Weibo is hosting exclusive Gintama footage. The ad is in Japanese with Chinese subtitles showing the characters enjoying KFC's Chinese brand.
Gintama is titled and marketed as Yinhun in China.
AnimePiracy is a site to watch online anime like Yinhun x KFC SUB online GoGoAnime, or you can even watch Yinhun x KFC in HD quality just like KissAnime and 9Anime.