I'm a little bit confused about what's going on here. Is this nothing more than an LLM-generated summary of her post? She shows the metadata but also shows it coming up in the post. I don't use any of these apps so I'm not really sure what a normal user would have seen. ie, would that text have been appended visibly to her post, making users think she wrote that, but also have been in tags which would have optimized for search engines?

Either way, I don't know what to tell people. Social media exists to take advantage of you. If you use it, your choices are "takes more advantage" vs. "takes less advantage," but that's as good as gets.