The anti-circumvention clause in the agreement is, indeed, one of the reasons why the Free Trade Lumber Council opposed the agreement at the time. It is a very worrisome clause.
For example, will this prevent the provinces from changing their policies? Probably not, but it will certainly be a constraint as to the type of changes that the provinces can make to their policies. And, if the new policies do not suit our American adversaries, they obviously now have an instrument—that they themselves developed—with which to go after us.