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The article in \cite{HolmlidAIPA2016} has recently come to our attention. Itmakes a number of extraordinary claims that each contradict well establishedfacts in several fields, ranging from atomic and molecular physics tosuperconductivity and superfluidity, with practically no supporting evidence.We think it worthwhile to rectify the literature with this comment.

Comment on 'Phase transition temperatures of 405-725 K in superfluid  ultra-dense hydrogen clusters on metal surfaces' [AIP Advances 6, 045111  (2016)]