This is the opposite of the article's thesis. Musical.ly hit a wall. Only after it was purchased by Bytedance, rebranded as TikTok, and Bytedance poured their magical, cultural-agnostic AI sauce (and ad dollars) did TikTok truly take off. By all indications, this AI magic was wholly created in China and retrofitted onto TikTok.
The article's thesis is that AI doesn't need to understand the culture when it can understand the person at an individual level. The closing anecdote emphasizes the point: a Chinese startup that has a number 1 news app in India and not a single person in the company can read any of the content in their app (Hindi)?! How is that for not understanding a culture?