It's not a Godot advertisement. The author is just excited about exploring the possibility of using a game engine for UI development. The point of this article

It's not a Godot advertisement. The author is just excited about exploring the possibility of using a game engine for UI development. The point of this article isn't supposed to be a full dive into the nuts and bolts of using of Godot for UI development or anything, just a speculative piece about a novel use for this piece of technology. I doubt the author even knows the answers to a lot of the questions posed. It's just bringing up an option that most developers wouldn't even consider. This article is asking a question, and just focuses on providing enough detail to frame that question. I don't think the negativity is justified.