I see your point.
It would work if the BC keeps their page up to date and you could argue, if challenged (unlikely), that the link is "publishing."
There is probably a smart cyber lawyer that would challenge the definition of publication or link to a secondary source but that's unlikely to ever happen.
In my example I can neither rely upon the PC clerk to have 'encouraged' Cllrs to have completed their declarations in a timely manner, nor upon the Cllrs to be personally responsible, nor can I rely upon the LA to keep their webpage up to date since they are (despite several reminders) still showing Cllrs that left over 12 months ago and not showing those that have joined >28 days ago.
I'm content with my reading of Mr Angry's reference above to justify the requirement to publish on PC website.
Since there is a statutory requirement, any PC NOT publishing (or perhaps linking to higher authority publication) must, by definition, be failing in AGAR Section 1 assertion 3 where they affirm actual or potential compliance with law...