The second part, “every international instrument to which Canada is a signatory that applies in respect of that substance”, would not appear in the registry.
I question the value of that, since the way Canadian law works is that whatever is an obligation internationally has to be implemented through domestic law, so that's how you know which instruments apply. You would see it in, for example, a regulation under CEPA that might prohibit the use of a substance that Canada had agreed should be prohibited under an international instrument, so that is not there any longer.