The revised Protocol on Ireland/Northern Ireland means Northern Ireland will stay in European Union Single Market regulatory alignment for goods, for a minimum of six years (four before the first Assembly vote, plus two subsequent) from the end of the transition period.
If during this time Great Britain [sic] diverges from the European Union Customs Union and/or Single Market regulations then a border must, per the new protocol, be erected along the Irish Sea between Great Britain and Northern Ireland.
The Belfast/Good Friday Agreement states in Constitutional Issues, 1, iii, that:
...it would be wrong to make any change in the status of Northern Ireland save with the consent of a majority of its people
If Great Britain diverges in customs or Single Market regulations during this time, would the Belfast/Good Friday agreement be breached?