The article makes clear that churches in Montreal are still getting their tax exemption if they stick to purely religious activities (prayer, worship, etc). They are only being taxed when they use their property for not explicitly religious activities like charitable uses, community groups, etc.
Do those people applauding this really want to applaud a policy that gives tax exemptions to specifically religious activities but denies them to activities that are less explicitly religious in character? It seems the opposite policy to what they actually want.