If C9 knew full well before they posted Lab Reports what 5P would most likely do, then I see it as "storming a windmill with a legal lance." For all we observers of the story know, 5P may take the issue further, and based solely on what C9 has already done.
5P now has to correct their image due to what C9 has done, while C9 (and their supporters) get to claim that C9 only published (accurate) test results. Yet, the damage is done, and observable on the forums. So, if C9 stands by the results, then I don't get why not keep them up? And if taking them down, then it is truly the decision of C9 to no longer discuss / debate the issue, due to money / bottom line.
No.
Storming the Windmill would be What You proposed.
Spending Copious Amounts of Money in a Legal Action with five pawns.

