Just how do you think that is done?
Governments don’t have the resources to moderate social media or the means of removing content if they did. They expect and rely on the cooperation of the platforms, who don’t. Being based in the USA under a Trump administration makes that doubly difficult. Just look at the resistance to our on line safety act!
So a belt and braces approach makes perfect sense to me and this way seems sensible and doable. Age verification makes sense but is a lot easier to write than implement. Providing a digital ID to those of an appropriate age is just common sense. I don’t understand why anyone should object. I don’t. I welcome being asked to help. I have nothing to hide so nothing to fear by needing to prove my identity.
I don’t live in Ireland and it’s been a long time since I was there, so cannot comment on your specific assertions. However, doing what the EU is proposing can only help improve things. It cannot make them worse.