That's not what the Supreme Court said in the majority opinion. They said that only certain kinds of irregularities count and the kinds of errors that occurred in the Etobicoke Centre case did not arise to the level of an irregularity.
You'll see this, for example, in paragraph 39 of their decision and also in paragraph 43. They said that the word “irregularity” does not count toward every single administrative mistake that was made. The mistakes that were made with respect to vouching in that case and with respect to the registration certificates did not, in their minds, arise to a level of an irregularity. These were just record-keeping mistakes. They said that under section 524.1 of the Canada Elections Act, those mistakes do not count as irregularities.