I don't think it's accurate to suggest that the minister is given any different powers associated with establishing this objective from the establishment of the milestone-year targets or the plans. The obligation rests on the minister, but that obligation has to be discharged via a process that is established in the act. Because the objective is part of a plan that is associated with that process, the process is exactly the same. It's up to you to decide whether it's adequate or not, but it's exactly the same for the objective as it is for all of the other components in the bill.
On May 31st, 2021. See this statement in context.