While it's not possible to use CSV management to bulk delete users, you can still bulk delete users by following the steps below:
Create a temporary team.
To create a team, open Administration from the top menu. Then select the Teams tab and click +Team.
Using bulk CSV management, move the users you want to delete to the temporary team you just created.
Note: If you need help with this, check out the article How to Bulk Import Users
Delete the temporary team:
- Go to Administration from the top menu
- Click Teams tab
- Click the red X icon to delete the team