I think you should probably speak with the Association of Canadian Archivists as well as the Society of American Archivists.
the term "archival collection" has very specific meanings in the context of archives. In Canada, archivists use the Rules for Archival Description (RAD) to guide their work. RAD defines an archival collection as follows:
"Collection. (1) A grouping of DOCUMENTS of any PROVENANCE intentionally assembled on the
basis of some common characteristic; (2) A level of description. (Collection)"
Archivists normally work with groupings of documents called 'fonds'. RDA defines a fonds as follows:
"Fonds. (1) The whole of the DOCUMENTS, regardless of form or medium, automatically and
organically created and/or accumulated and used by a particular individual, family, or
CORPORATE BODY in the course of that creator's activities or functions. (2) A LEVEL OF
This is all a long-winded way of saying that in the world of archives there is a distinction made between a fonds and a collection. For the layperson, these two terms are frequently used interchangeably, but they do have specific meanings and usages. My concern with the definition presented here is that it is using the language of archives somewhat imprecisely, which may lead to confusion if dealing with actual archivists who use the fonds/collection distinction in a technical manner.