It would seem like it's more a blow to free speech. Wasn't it in Canada that somebody got hung out to dry (judicially) for claiming the Holocaust did/didn't happen? If the judiciary can tell us what we can and cannot say, well, I guess this experiment in government is ended -- and it failed.
Caveat auditor, caveat lector.
Thurston Bell was taking money in return for giving advice that he CLAIMED would reduce your tax liability to ZERO.
The claim was incorrect.
The courts can and do enjoin speech pursuant to fraud.