No. With ILM data is only archived if there is a reason for doing so. This reason is represented by the retention rule(s), upon which the system calculates the expiration date.
If no active retention rules exist, it is not possible to move the data to the WebDAV store. Once moved to the store data can only be destroyed in accordance with the associated rule(s), that is if the expiration date has been reached.
Most ILM-aware storage solutions guarantee the integrity and authenticity of the data contained, therefore circumventing the retention rules and simply deleting the data is not possible.