Good question, and I will update the description, as the answer is in what was moved and what was not moved but not articulated above.
No. Articles & Guides is not reserved for LinuxBlog.io articles.
Articles and guides, especially when the topic creator is personally connected to them, belong in Articles & Guides or Showcase. By personally, that includes being the author, or having personally tried, downloaded, installed, tested, asking a question about, or interacted with something being discussed in an article and so bring their voice to a topic for discussion.
That’s why a topic like this one you posted, and other topics by others were not moved:
The distinction is that the author has a personal connection to what they are sharing.
On the other hand, a topic I posted in the general forum was moved to News & Shares
In my case, I have no connection to the article beyond finding it interesting and sharing it.
Now, for example, I were explaining how that patent affected me, my work, or something relevant to members here, or needed help answering a question regarding it, then it would be a better fit for General Discussions because I would be adding my own experience or something beyond the title or news.
So the simple distinction is: if you’re sharing something because you found it interesting, use News & Shares . If you’re sharing something you’re personally connected to, or adding your own experience, testing, analysis, or discussion, Articles & Guides Showcase, General Discussions, Help & Support etc. may be the better fit.