To be fair, the answer given wasn't to the question you asked, so your thought might be correct. Organic food is more expensive than non-organic food in Ireland. That doesn't answer if it is more expensive than organic food in the US (or if the mark-up is more/less).
To be fair, your question isn't actually one that can be answered. Prices vary across Europe (it being a continent of many countries) and even across the US.
I live in Switzerland pretty much all food is more expensive here but I've never compared the organic to non-organic mark-up. It's also a tough comparison because, due to differences in laws, some of the "standard" products here could be labeled as organic in the US (because certain pesticides, hormone use, etc. are not allowed). Not sure, but may be the same in other European countries.