I very much doubt that they do have permission to do so, though it wouldn`t totally surprise me if they did file dummy plans irrespective of the service agreement.
Are you sure that you didn`t confuse your information with the fact that CFMU does offer a test system to check for route validity?
In any case if it should be true, this would unnecessarily increase enroute CTOTs for everybody else, since ghost flight plans are blocking a CTOT were other (real flights) might fill in.
Cheers
fcit