The exemption authority is a regulation-making authority giving the Governor in Council the authority to make regs—for this one, to exempt something. This is the normal way that exemption authorities have been written for most of our statutes. You can exempt something without conditions or with conditions, and those conditions would be set out by the GIC.
The Governor in Council would propose the conditions. From our perspective, those would be justifiable, in that we've developed a case for them, we've put them through the regulatory process, the proposed reg has gone through GIC 1 and GIC 2, and there has been comment. That's really the justification for those conditions.
I don't think the wording “justifiable” adds anything, and it also removes the ability to exempt something completely, without conditions.