What the EU was quoted as saying in the news item as to their reason for overiding the Irish Protocol by taking the powers to stop Vaccines poing th Northern Ireland

"This is justified as a safeguard measure pursuant to Article 16 of that Protocol in order to avert serious societal difficulties due to a lack of supply threatening to disturb the orderly implementation of the vaccination campaigns in the Member States."

What they actually meant was

"We messed up our vaccine supply and we are now trying to blame anyone else we can particularly the UK"