A current Ramadan fast is the obligatory fast observed in Ramadan itself. A qaḍāʾ Ramadan fast is observed afterward to discharge a missed obligation. Both matter, but their expiation rules are not automatically the same.
Under the text, specific deliberate violations of a present Ramadan fast can require kaffārah, whereas the quoted restriction excludes this kaffārah from a fast observed outside Ramadan.
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Kitab al-Sawm: Fasting Hours, Invalidators, Qada and Kaffarah
A current Ramadan fast is the obligatory fast observed in Ramadan itself. A qaḍāʾ Ramadan fast is observed afterward to discharge a missed obligation. Both matter, but their expiation rules are not automatically the same.
Under the text, specific deliberate violations of a present Ramadan fast can require kaffārah, whereas the quoted restriction excludes this kaffārah from a fast observed outside Ramadan.