I am not sure whether I have understood the Minister, but section 4(1) is of course subject to subsection (4), which states:
“A treaty or Article 48(6) decision does not fall within this section merely because it involves one or more of the following: the codification of practice…; the making of any provision that applies only to member States other than the United Kingdom; in the case of a treaty, the accession of a new member State.”
Subsection 4(4) does not appear to be triggered in this case.