Can we disable FYI notifications - "Resource 'Name' Is No Longer Available for Project Assignments"

We periodically receive FYI notifications, "Resource 'Name' Is No Longer Available for Project Assignments" to the Project Manager.

From another discussion, I can see that the expectation is that before a resource is terminated in HCM, the resource assignment should be end dated.
Please could anyone support with my questions below?

1. Does the notification trigger when a resource is terminated before the resource assignment is end dated?
2. Is there a scheduled process or job which runs or does the notification trigger immediately?
3. Has this workflow always been enabled or is it a recent update from 24D?
4. Is there a way to disable these notifications?