Circular reasoning is not always a formal logical fallacy; in epistemology and the justification of basic logical rules, rule-circular arguments can be valid and epistemically useful.
The claim states that circular reasoning is 'always' a formal logical fallacy. However, literature in the epistemology of logic (such as papers [2] and [5]) shows that rule-circular arguments can be epistemically productive and do not automatically constitute a fatal fallacy when establishing basic rules of deduction. Therefore, the absolute claim is refuted.