The news bulletin was just released on Friday night. What Northvolt have said is that "1 600 jobs must go". From what I understand, 1 000 of these jobs are at the factory, 400 are at the labs for product development and 200 at the head office in Stockholm so they are spread over the whole company. As yet nobody has been given notice of termination of employment, so you won't see any changes yet. Just a couple of weeks ago they were talking about just 300 jobs that must go! Naturally, the unions are up in arms.
I think most people have expected this as Northvolt has been experiencing a financial crisis for a couple of years now and bankruptcy has been up for discussion on several occasions.