I disagree. What if all his news needs are met by that single source? No motive implied at all. Perhaps he just has a lack of intellectual curiosity. Perhaps he simply lacks time to scan multiple news sources. Perhaps The Catholic Review is just his favorite news source.
Were content of material the goal, there would be more than one source.
He posts on a variety of topics. That, to me, implies that that the content is what he finds interesting and hopes to spark discussion about. I don't see the logical connection you're making.
The monolithic sourcing indicates a motive beyond content.
It would seem to me that you're implying a nefarious motive. Otherwise his motive would not bother you. So I don't agree that the "motive beyond content" is either indicated or relevant. If I were interested, I could probably think of at least a half dozen motives for the single sourcing than I've already listed, none of which implies any nefarious motive.
Implying, no.
Pointing out and accusing yes.
Note that the pimp is unaware of any comments and fails to defend itself.
Why would that be, do you think?