The intent of the legislative drafting was to align with the language used by the Supreme Court of Canada. The alignment provides an advantage for someone reading a piece of legislation and hoping to understand the intent of the provision, because it points very clearly to the Supreme Court decision, and the court in its decision elaborated on all of those points.
The intent is to make a clear link between the legislation and the Supreme Court of Canada decision so that the legislation doesn't bear the burden of that interpretation, and so that the entirety of that court decision can be seen to be a direct link into the legislation, so that the interpretation can be maintained.
I would agree that the statements, for example, of nurses present at a site as one of the clarifying statements in the court decision would support the term “regulatory structure”. The intent is to make the link very explicit so that the entire interpretation of the court could be seen to apply to the provision.