Would posting to 20,000 people telling them that I was using multiple Slack aliases to 'steal students' from Codesmith's community - which was entirely and utterly false in every aspect of that statement - count under this definition?

If you believe that happened, your belief provides a motive for many of the actions that the linked article attributes to you. This makes the overall story easier for us readers to understand.

To that extent, it might be relevant. But you'd want to consult a lawyer about it.