Speculative: They say they haven't seen the final numbers because they're currently negotiating with Teck and don't want to give the impression that things should be done shortly (which you'd expect if they've seen final numbers).

Realistic: What are considered "final numbers" and what they've seen aren't the same thing. That is, they've seen numbers and are making minor edits from the review process so the numbers aren't "finalized". In fact, they're not finalized until they're totally signed off on and released to the public.