I'd start by saying that the scope of the section is already on a telecommunications service provider. It gives the government the ability to tell a telecommunications service provider what it can use in its network. The obligation is on the telecommunications service provider itself as to whether it can buy certain types of equipment or procure certain types of services.
The type of corporate entity that a TSP will buy goods and services from is much broader than just other telecommunications service providers. It's equipment manufacturers. It's software producers. It's battery manufacturers, etc. There are a large number of those.
Basically, it's already scoped to say that there may be obligations on Bell Canada, or whoever, in terms of what they can procure or put in their network. The reason it's a “person” is that Bell Canada may procure goods and services from a wide variety of vendors.
If you limit the scope of that power to only taking action against buying from other telecom service providers or other people responsible for telecom services, you can't prevent them from procuring from equipment vendors that are high-risk.