It does not say “unless the substantive motion relates directly to the business under consideration”, and that would mean it's at the discretion of the chair or in the interpretation of the chair of this motion, which could be anybody's, I guess. The way it's written, it really doesn't say that the substantive motion relates directly to the business, so that would mean we would have to give 48 hours' notice for every motion, even for business of the committee that we're dealing with.
En effet, il ne précise pas « avant que le comité soit saisi d'une motion de fond qui ne parle pas directement sur l'affaire que le comité étudie à ce moment », ce qui signifie que la décision dépendra du président, ou de l'interprétation qu'il donne de la motion, interprétation qui pourrait celle de n'importe qui.