I wanted to document this here. The permanently delete functionality for various user groups:
| User Group | Has Permanently Delete |
| ----------- | ---------------------- |
| Admin | Y |
| Moderator | Y |
| TL4 | N |
| TL3 | N |
| TL2 | N |
| TL1 | N |
| TL0 | N |
Feel free to correct me if this isn’t right, but I was able to do a quick test on my Forums.