Was this actually confirmed somewhere?
No it was not.
The PC Gamer article mentioned something about dealing with some issues at the Chantry in Val Royeaux, and people are assuming that one of the achievements (A Capital Occasion) is what you get for dealing with said issues.
This interesting bit of confirmation bias is occurring because people believe we are going to Val Royeaux (capital), that Capital (in the achievement) is being taken literally, and not knowing how the missions actually work. It is quite possible we just send off some agents to deal with the chantry in Val Royeaux and it's handled entirely off screen.
We won't know until the game drops, but using the facts that have been listed in this thread like ,no one from Bioware commenting on this thread what so ever, even though its a hot button topic is suspect in my books.
Is there any game company that has directly commented on any leaks? BioWare never commented on the "leaks" last year(?) that supposedly covered the entirety of the story (and was since forgotten by the vast majority of the forums).
The only time I remember BioWare commenting on anything "leak" related was when IMDB incorrectly listed the voice actor for Solas. Of course, that really wasn't a leak but an incorrect statement.