At the time of the announcement, the moderators of most of the subreddits involved with the community points program claimed to be unaware of the decision.
Wasn’t this information public for days before the dump? I don’t think this can be considered anything illegal if that’s the case, everyone had the same information available. Mods don’t get some sort of special insider preview of most things like this.
When clicking on the article, the line under the title says: "Analysis suggests at least three Reddit moderators dumped thousands of dollars worth of Moons just minutes before the actual announcement."