I understand what you are parsing, and it is missing something, but I think it reads fine. Like.. "Experts say the reasons why TikTok (_topic of the article_)

I understand what you are parsing, and it is missing something, but I think it reads fine. Like.. "Experts say the reasons why TikTok (_topic of the article_) remains unclear." Or perhaps it's referring to the previous sentence or paragraph. I do think the hyphenated subsection sets the tone too. Made up example: "The President today issued a statement. Experts says the reason why The President - who has issues statements in the past - remains unclear.