Confluence REST API: adding content restriction on delete operation

The API for add content restrictions appear to list delete and purge in the list of operations that can be restricted: https://developer.atlassian.com/cloud/confluence/rest/v1/api-group-content-restrictions/#api-wiki-rest-api-content-id-restriction-post

But I’m getting a 400 bad request when attempting to create a restriction on delete and the response says only read and update are supported:

{                 
    "statusCode": 400,    
    "data": {                     
        "authorized": true,    
        "valid": false,          
        "errors": [          
            {    
                "message": {
                    "translation": "unsupported operation type: <delete>. Please use one of: [read, update]",
                    "args": []                       
                }
            }          
        ],                                                                                                                                                                                          
        "successful": false
    },    
    "message": "com.atlassian.confluence.api.service.exceptions.BadRequestException: unsupported operation type: <delete>. Please use one of: [read, update]"
}    

Any clue if restricting delete is possible via APIs?

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