You'll understand when you get your first job with deadlines.
Delayed means that something is not ready/released when it was 1) supposed to be ready or 2) promised to be ready. Thus, it is delayed if it's released after 2020 because that is the date customers are currently given. "Delayed" has nothing to do with the product being finished or not.
You even see gaming companies use the term if the original release date is pushed forward...