Then, in the 1990s, it was applied to demographics -- and the word took off. Suddenly, the word appeared everywhere, in all articles, on every subject.
I saw an article on a new park opening. A typical headline, 30 years ago, would have been "City Opens New Park." Instead the headline was "New Park Attracts a Diversity of People."
The word is being injected into everything because it's associated with demographic diversity, so even when we talk about a store offering a diversity of products, it creates a subconscious sense that (demographic) diversity is good and necessary.
For that same reason, the use of the word is a form of virtue signaling. Using it, in any contexts, signals "I am a good person because I love demographic diversity."
IOW, your comments don’t have anything to do with the actual information in the article.