Rodríguez-Navarro (2026) argues that Europe's limited production of scientific breakthroughs stems primarily from research inefficiency, measured by the conversion of highly cited papers (top 10%) into exceptionally cited papers (top 1%). This comment examines that proposition using Portugal as a boundary case. Applying the same indicators, estimator and CWTS Leiden Ranking data to the country's six largest universities (2020–2025 editions), I find no evidence of an efficiency deficit. https://zenodo.org/records/21429760
