Which claim from the article you refer to? I don't see it saying that US razed a city to the ground or wiped out most of the population of entire towns.
And the Ukrainians, who have a rich history of manufacturing weapons, etc. have shown some extremely interesting defensive techniques, many of which would qualify as novel.
The heavy use of drones is the most dramatic example of that.
That being said, the article undercuts itself in precisely the way you’ve mentioned since it recognizes towards the end that urban warfare is not new, and further old school methods work as well, if not better, than newer tech.