Before Bill C-14 came into effect, a Canadian parent of an international adoptee needed to sponsor that international adoptee through the immigration route and then apply for a grant of citizenship. What Bill C-14 did was that it removed that requirement to go through the immigration sponsorship route and opened up instead access to a direct grant of citizenship for an international adoptee, thereby minimizing the distinction with the first-generation child born abroad to a Canadian.
On May 31st, 2023. See this statement in context.