That blog is private, you can find the info here; https://blog.splibrarian.com/2013/08/22/filtering-views/
Here’s a quick list of the workflow states I typically filter against:
In Progress = 2 Approved = 16 Error Occurred = 3 Not Started = 0
- Not Started = 0
- In Progress = 2
- Error Occurred = 3
- Approved = 16