My understanding is that an application is made, in this case by the Métis settlements, to the CRA and/or Finance Canada to recognize them as a government and to give them those exemptions. Once you make that application, as my Finance colleagues have told me, those exemptions continue. You don't need to continue to apply for those exemptions. The settlements have been recognized as governments.
Of course, the settlements, somewhat uniquely, have land holdings, so there is some complexity to some of the tax exemptions. At the end of the day, the process is that they've applied for these exemptions, they've been granted these exemptions and they will continue to be granted these exemptions.