The question, as has been noted, is who is the original source of the information and whether they were obligated to refrain from sharing it. If it's material non-public information that was provided by a company insider, it's improper and would require its prompt and broad distribution to the public. Those that were directly provided with the information would be in violation of insider trading rules if they traded on it prior to its being published by the company. If it was shared by a pipe investor who signed a confidentiality agreement, it's a violation of that agreement.
Your link, from Stephen Bainbridge's Journal of Law, Politics, and Culture...the blog of a law professor....doesn't say anything at all that contradicts any of that.
I have no idea what's goin' on.......