To directly answer the question, Rednote is not generally used outside China, and the point about these apps being representative of "global" social media apps is false.
RedNote was #1 on the App Store download list for a couple of days.
https://www.vice.com/en/article/chinese-app-rednote-hits-1-i...
It received some popularity among TikTok refugees from the US and subsequently also from around the world by users who got curios about what the fuzz was all about.
Xiaohongshu is used by a lot of huaqiao outside of China. It has a sizeable overseas userbase, but it also has 300M total users.