https://www.nytimes.com/programs/better-reader/day-1

Google shows that the term is on the page. But when I try to access it, it redirects me to a signup page.

What's the deal here?

Does Google not notice that? Does it turn a blind eye? Does the NYT trick Google by displaying something else to Google then to me?

Or are pages that only members can read now part of the Google index?