Some plaster against the ribs of that plug are not enough; it will likely yank out of the wall and may take a chunk of wall with it. In older plaster-and-lath construction, you'll most likely crack/damage the plaster from the flexing caused by the plug pulling against the lath in the wall.
As the original article says, you'll want to hit a stud, and IMO even that (alone) is not enough for this kind of application.
In America most houses are wood, and I don't mean log houses.
And there is no way wall plugs would work in that kind of American wall.
By the way : concrete isn't bad as you think. There are different type of concrete.But... While it's strong and resistant to fire, if you live in somewhere where the earth quakes are common, concrete is a bad choice. Also metal frames in the concrete is problematic, they have to be resistant to the water (galvanized etc.) or in time they will rust and tear apart the concrete.