I guess, first off, from my understanding of what British Columbia put in place, it was a global restriction, so it applied to those arriving from the rest of Canada and from out of country. To the extent that the specific proposal in C-43 is that a minimum residency requirement could not apply to Canadian citizens, so those who were coming from other provinces and moving to B.C., that would still constitute a violation of the Canada social transfer today, and so the Minister of Employment and Social Development would be required to embark upon the withholding process that is laid out in the act and refer the matter to Governor in Council for a withholding as it saw fit.
On November 17th, 2014. See this statement in context.