I had to read it several times as well: You can build houses in a variety of construction methods. Concrete, Y-tong, bricks, Styrofoam shells filled with concrete, and so on. The house is also covered with a plaster layer. In Italy, this is often a lime coat that is smoothed, in Germany there is usually a spray plaster.
Regarding the pictures: These are beautiful buildings, but I’m afraid you have to save for several years to afford such a construction. Or find a building plot where you are allowed to build something like that. Friends of ours recently gave up their dream of a Tuscany house because there are no building plots here where such a thing is permitted. Too many regulations.
But it is nice when, as a young person, you have a goal in mind.