As you can see from your weblink you provided, there is a list of the original attendees. That list grew after several meetings, and it was intended to be filtered down to members.
Based on the goals -
Meeting participants unanimously agreed to establish a Task Force of home inspectors to voice industry concerns regarding the CSA A770 standard from an industry perspective and provide a format where the industry could offer back to the authority information that could help better define a workable standard.
Following on from this meeting it was identified that there was much the various participants could offer to the profession without having to give-up their own independence, and a decision was made to form a cross Canada, non-partisan federated alliance of organisations that represent the 4,000 plus Home Inspectors working in Canada.
The vision is for the Alliance to work together to address multiple subjects that affect the profession, including consumer protection, development and advocacy of the Home Inspection Profession outreach to the public and recognition of the profession as a respected service.
Follow-up - The net result the alliance achieved their objectives, and we now have a CSA Home Inspection Standard for Home Inspectors that was modified. Perhaps not fully enough, but it certainly is much more tolerable than what was in the original draft.
Whether one chooses or is otherwise mandated to follow it, is based on regulatory requirements. Currently I believe NO province has made the CSA Standard mandatory to follow.
Hope this helps clarify your concern. It certainly provides evidence that associations can work together on common interest.