Everything CBJ said was stated as opinion on an internet forum designed for the free exchange of opinions; there's no legitimate court in the world that would convict someone for libel in these circumstances.
So, here is the Defamation Act of 1952, which although UK based, all commonwealth nations (including Canada) have adapted into law section 2;
Slander affecting official, professional or business reputation.
In an action for slander in respect of words calculated to disparage the plaintiff in any office, profession, calling, trade or business held or carried on by him at the time of the publication, it shall not be necessary to allege or prove special damage, whether or not the words are spoken of the plaintiff in the way of his office, profession, calling, trade or business.
Well, he didn't state anything as fact (and I would argue that nothing said on a forum designed for the free exchange of ideas and opinions can be stated as fact) for a start. he also did not try to imply that the company was of no value to respective buyers, just that he felt what they were offering was not a good deal; their value and that of their product is open to interpretation and he provided his own opinion on that matter.
None of which matters because the Human Rights Act of 1998, which was signed into law in the UK and therefore, once again, any commonwealth nations (including Canada) states;
If the person against whom the application for relief is made (“the respondent”) is neither present nor represented, no such relief is to be granted unless the court is satisfied—
(a)that the applicant has taken all practicable steps to notify the respondent; or
(b)that there are compelling reasons why the respondent should not be notified.
In other words, Art Fighters would have to get hold of CBJ personally, not as an anonymous online figure to even proceed with any legal action. If he just changed his username, the moderators of this board have no legal imperative to give out IP information, CBJ would be unreachable and Art Fighters would be responsible for finding a man they know nothing about in a foreign nation or else it all falls through.
The court must have particular regard to the importance of the Convention right to freedom of expression and, where the proceedings relate to material which the respondent claims, or which appears to the court, to be journalistic, literary or artistic material (or to conduct connected with such material), to—
(a)the extent to which—
(i)the material has, or is about to, become available to the public; or
(ii)it is, or would be, in the public interest for the material to be published;
This is the big killer for the libel argument. Once again, this is a forum for online debate, free exchange of ideas and opinions. As long as that is the case, anything expressed here is protected as journalism, given that these are ideas and opinions expressed individually and made publicly available. Moreover, due to the unusual nature of the company's business strategy, it would be very easy to argue that what CBJ has said is in the public interest- they don't have to agree with what he said, it is simply a critique of their (untested) methods, the results of which are speculative for anyone involved and therefore a voicing on potential negative outcomes is of public interest.
One last thing; I am not a lawyer, I have never studied law. I'm just a guy with Google and I have no interest in starting a legal battle against someone who is studying law over a case that has not gone to court and almost certainly never will. This is my interpretation of the law as it stands, let's leave it at that.