These current regulations in regard to COVID-19 restrictions include requirements that apply to businesses and services where intoxicating liquor is sold or supplied for consumption on the premises, where alcohol may only be served to those also ordering a substantial meal prepared in an on-site food preparation area (as defined in the regulations) and for consumption during or after the meal.
However, these regulations do not apply to unlicensed cafés. Unlicensed cafés can provide food and non-alcoholic beverages without the requirement for a substantial meal prepared on-site.
I understand that Fáilte Ireland have updated the relevant section of the guidelines published on their website to ensure the position is communicated clearly.