I think the first problem in all of this, was this teasing post and then the long void with no progress after it. I followed Rubino's coverage closely, and I don't think it was too much in general.
An exclusive teasing post like this creates interest (click bait), which generates revenue for the page. I really don't want to claim that this was the goal of his initial post, but it's something that led to financial gain for WPCentral. After this there was the post that this app will be published, which I find okay. However, following this 'presentation' there was a long delay in which the developer just wasn't ready, and all the updates on the topic made by Rubino transformed him into "the inofficial spokesman of Instragraph" as written by another Windows Phone Blog.
Maybe the developers of Instragraph and Rubino should just have waited a little bit longer with starting to hype this application.
And finally there's the last problem: This app is a heavy workaround (for a pretty steep price, not measured by the effort put into making it possible, but in comparison to other platforms and the provided functionality) and it's even proudly emphasized that it does it in a way that can't be blocked by Instagram. Every blog except of WPCentral discussed this very controversially, Rubino didn't.
So did Rubino or WPCentral anything wrong? In my eyes not really. But did they do the coverage in a slightly awkward way that can make people think? Yes they did.
And let's not forget: The whole Instragram situation is very polarizing anyway, with three groups of people: The ones that really, really want it, the ones that really, really hate it, and the ones that just don't care. So controversial opinions should be expected from the beginning.