Sure, but it's Twitter. This isn't on the "our commitment to quality" page though. They also said the game would be out in April, then October, then November. They were making it super duper awesome and it was totally finished. So, sure, they said it. Doesn't matter.
Not sure what your point is.
Doesn't really matter where they said it. They said it.
It's also on the official website if it somehow makes it more relevant - https://www.cyberpunk.net/en/news/37076/important-update
If you say you'll do something, it's usually a good thing to follow through. Regardless of where you said it.