"But when he was made aware of concerns on social media, he sought out Chief Justice McLachlin to see what could be done."

The optics of this reflect poorly on the Supreme Court of Canada. The Court altered its position on who could 'intervene' in the case because a hullabaloo was raised on social media.  While I think the original decision was lacking in not including at least one LGBTQ group, altering that decision based on social media noise is highly questionable. It's no different in appearance than had an angry crowd waving placards in front of the Supreme Court caused it to change the decision.

By all means, the Supreme Court of Canada should be willing to revisit and modify its decisions. But it should do so based on public submissions to the court, not on someone's reading of a Twitter feed.