I don't think that's a mistake. In Spain, the head of government is actually referred as "president". The words "prime minister" are never used, except when speaking of foreign leaders.
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Wikipedia:
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Some countries with parliamentary systems use a term meaning/translating as 'president' (in some languages indistinguishable from chairman) for the head of parliamentary government, often as President of the Government, President of the Council of Ministers or President of the Executive Council.
However, such an official is explicitly not the president of the country. Rather, he is called a president in an older sense of the word to denote the fact that he heads the cabinet. A separate head of state generally exists in their country that instead serves as the president or monarch of the country.
[...]
The Prime Minister of Spain is officially referred to as the President of the Government of Spain, and informally known as the "president". Spain is also a kingdom with a reigning king.
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