On the morning of June 11, 2019 I had one of my lawyers file a defamation claim against Mandy with the Superior Court of Justice in Ottawa for her Facebook post (CV-19-00080461-0000 - Ottawa Cour Supérieure de Justice). What we say there matches what I've said all along: the various allegations in her Facebook post are false.
If you're wondering why it took so long, it was because I was making sure I tried everything else first to reverse the harassment campaign Mandy launched: I put out statements from witnesses and evidence disproving her claims, people familiar with the case took on the accusations all over the internet, Mandy's own family even sent letters to the companies that had sanctioned me saying that Mandy wasn't telling the truth, and the witnesses made themselves available to the public to be questioned. Especially within the game community, those responsible for spreading Mandy's false accusations ignored the evidence, actively took steps to cut off communication and refused to investigate. Litigation was the only effective option left.
Since there will likely be some response to this announcement on the internet, here's a note of legal advice: When Mandy's initial attack post came out in February, many folks (especially gamers) repeated her accusations--and piled on others. If anyone does that again now, months later, it only makes it easier to sue them for defamation than it already is.
Also, repeating easily-disproved statements that show you didn't do any research ("Zak is a trust fund baby" etc.) likewise makes it easier to establish in court that you didn't make any good-faith attempt to check your facts before making a public attack.