You are of course correct that the CA was announced then, but the news article was also about the fact that Let’s Encrypt had just turned five years old on the day that the article was published, and was a look back at what they have achieved over the last five years as well as looking to the future.

It was also noteworthy that they are moving to ECDSA and have reduced the length of their certificate names to save bytes (packets) in the initial TLS connection.