You seem to have linked to the wrong place. That's a comment about a permanent bank holiday being better than gesture politics. It doesn't say anything about EU averages. If in fact he did then he's wrong. If you want to know the average then look at countries that don't have a day in leu and divide their number of holidays that are date specific by 7 and multiply by 5. This isn't a matter of opinion, it's basic maths. If you want to make an argument that we should get more public holidays that's fine, I kind of agree with you, but tell the truth about the numbers.
In fairness to the Unions telling lies by misrepresenting the facts is so engrained in their thinking that they probably don't know how to be truthful.