I quite like this as an idea. However it is not yet a theory; it's a hypothesis that tries to make sense of some "facts" as translated and disseminated by Ram Tah. Now we know that FD aren't above being Machiavellian and might be putting out misleading information/comments, so I advise caution in accepting "facts" as we have been told until somehow corroborated. What you need to do to make this idea into a theory is see what predictions it can produce which can then be tested. If tested positively then it becomes a theory which will suffice until it is deposed by a later theory that explains more "facts" (there's a link in my signature to a discussion of scientific method)
You may already be trying to do that, since I think you imply it predicts the Guardian homeworld is in Wregoe and from your subsequent post you may be trying to search around there. Good luck in your search! Can you get any more predictions out of your idea that could be tested?
I do think there is more to be found out about the brain trees. The sounds they make seem to me to be based on human speech patterns though heavily distorted (I have a 6 minute recording). I don't think (though my memory is poor) that they have yet been thoroughly analysed by sound experts.
Coincidentally I am just reading a thriller where a religious expert points out that Totems are symbolic, whereas Relics are the remains of persons or are objects 'sanctified' by contact with the person. So might the Guardian relics contain parts of Guardian DNA and that us what injures the Thargoids when chunks are embedded into the AX missiles? Just a thought!
If you jump into my guardian thread, there's a new idea regarding the sounds of both the brain trees and ancient ruins.
Basically, there may not be a message at all buried in them, they are merely showing us that the brain trees communicate by analogue, and the ancient ruins are digital (more about it in my thread)