No settings are not deleted
It still exists in core.php
Configure::write('Security.level', 'medium');
But...
It is not used in 2.x.
The only reference to this parameter is in Security :: inactiveMins - which is not called by anything else. Therefore, while there is still an artifact of this parameter remaining in 2.x, the intent of this parameter has been removed and therefore it is not in the 2.x documents.
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