Will you explain why you didn’t do that in the first place instead of threatening to sue him? Forgot that little tidbit.
I’m not a lawyer and don’t have any special expertise in libel/slander laws, but I’m guessing that before taking legal action in a case like this, a manufacturer has to first publicly and/or privately advise the alleged offender that they have made false claims about their product and that if they don’t stop doing so then legal action will be pursued. Otherwise, a lack of such a warning immediately after the manufacturer becomes aware of the alleged false claims might indicate tacit approval and could affect any right to future legal damages if the matter can’t be resolved out of court.
I haven’t reviewed all the reports cited in this thread, but it sounds like Tekton could have been more tactful in how they went about dealing with the reviewer, but it may have been legally necessary to protect any future case.
Tekton would have to prove malice on the part of the reviewer, which is just short of impossible.
Again, I'm not an expert but I'm not sure a finding of malice would be necessary. As I understand from a bit of googling, malice is required for a defamation finding against a public figures or officials. In all other cases, mere negiligence in making knowingly false defamatory statements is sufficient. So it seems that if someone knows that a claim is false and makes it anyway, it may be actionable regardless of motive.
I hate to sound like a defender of big business, which I'm not, but the law can be complex (probably too much so!) and it's not usually a good idea to reach conclusions about stuff like this unless you 1) know all the facts, and 2) know the law.