Sirius does have dj's and some may even be live as there is current content.
I've been to several of their studios in DC and NY, and very few are live. It's almost all computerized VT. They can easily add any current content and insert it into the automation. Very common in radio going back 40 years, when automated stations would insert local weather or traffic, pre-taped on carts.
Keep in mind that everyone is looking to cut costs, not just broadcast radio. Sirius is keeping costs down, so is Pandora.
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