These are good questions that you should probably be asking the department. They conducted their review. However, I gather as well that sea lice was not factored as a risk assessment coming through the Cohen commission looking at migrating sockeye. However, sea lice is a condition of licence and there are exhaustive studies and reviews ongoing with sea lice. Not to paraphrase them, but I think the department was quite clear about why it wasn't part of this particular review, because it's an ongoing area of research and evaluation.
On December 7th, 2020. See this statement in context.