I think your first sentence rings a bit hollow when Irish drivers who get caught for speeding the uk don't have points added to their licence. A uk licence is not a foreign licence as the UK is in the EU. The UK have the good sense to accept a EU licence after brexit.
And your first sentence is totally shot down when you read here:
Almost half of summonses for motorists to appear in court for speeding offences since 2017 have not been served, letting thousands off the hook.
yes irish drivers who are caught and avoid penalty points are they ......
The irish government are assuming that it will be a hard brexit and are scaremongering because they see a quick buck, shame on them when they then espouse to get on with their close neighbour.