The paragraph cited seems to be more about whole panels, and structural parts like roof pillars, not small patches.
When doing structural parts like unibody frame rails, I used almost the exact procedure the listed, even though I had never seen it written out before.
For small patches to replace rust, which I don't consider structurally significant, I did butt weld. I guess one could argue that any patch in any panel is structural, but I'm not buying that.When I had significant rust, I replaced the whole panel at the factory joint with similar spaced plug welds.
Nowhere in the cited article did they talk about the patch being visible or not after filler.
As for the subject of this thread, obviously there is no structural consideration.