I think it's a slightly different meaning. Each target in the bill as currently written has to have its own plan. This amendment refers to an objective, which would be contained within a plan. I think the expectation would be that the 2030 plan would include measures to achieve the objective, but there wouldn't be a stand-alone document or plan that would be specifically associated with the objective.
On May 31st, 2021. See this statement in context.