The author does leave out the most traditional way of taking a city in face of opposition: starving it to submission. I think a fundamental blind spot in the article is that it doesn't explain why US forces employ high explosives so much more than other armies
Those forces do not face an army when they take a city: they face a collapsing civilian state. When the restoring state or a foreign country sends a "liberation" army, the situation is very different: two armies are facing each other.
It was the same with nazis in the first phase of WWII: a prepared, determined and fanatic army faced unprepared troops. They took large chunks of Europe with little combats and destructions (Central Europe, France, Belgium...).
Then it took a hellfire to get them out.
The amount of casualties taken by the French army in 1940 seem to indicate that there were some fighting. And the French army tried to counterattack multiple times (Arras, Stonne), even if they lost each time. The Polish lost also a lot of men.