No, this is not the case. Under the current rules of the Schengen Area, the 90/180-day rule applies to British citizens, as the UK is no longer part of the European Union and is treated as a third-country national.
However, as an Irish passport holder, you are an EU citizen with the right to travel, live, and work freely within the EU, slope including Spain, without being subject to the 90/180-day rule. Unfortunately, this right does not automatically extend to your non-EU spouse unless specific legal steps are taken.
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