I'll do my best.
The Lobbying Act covers an individual who is paid to communicate with a public office holder on a registrable activity. A public office holder has always included all members of Parliament, government institutions, or those working in government institutions, GIC appointments, etc.
The difference is that when the Lobbying Act came into force, a subcategory was created of those public office holders to represent the high-level decision-makers. In creating that monthly report, for example, it showed not only who the lobbyist was lobbying in terms of initial registration, but who they were communicating with on a monthly basis, which is the reason, I understand, that Parliament added the designated public office holder category.
Members of Parliament were not previously included in that subcategory of designated public office holders, but on September 20, through regulation, the government included members of Parliament into the designated public office holder category.