There rarely is any useful information in opening sentence or paragraph of a typical article, so as with banner blindness, it's excusable to read the article and still miss it.
Yeah. That's an oops on my part. The "first paragraph" isn't part of the article text. It's styled as a quote, summary, or caption. Safari's reader view displays it as such. (Gray sub-heading) I tend to skip those because they are often misleading.