lol no. 50 might just cover ActiBlizz accounts payable department.
I work for a similar sized company now. We have around 300 just in Finance. Another nearly that many in accounting. When companies get this big they have a lot of spending and assets to track.
Then you get into Marketing, Sales, HR, etc. I'd confidently bet 90% of the 1900 roles were corporate administration. I've personally gone through this process multiple times. I've even been part of making consolidation decisions for a few of them.
Edit: What you experienced will happen. But as phase 2.