But anyway, it's not very fitting for drones, because they are not capturing any territory.

Agreed, the entire aim of a Blitz or Blitzkrieg is territorial capture and encirclement of large portions of the enemy that can be isolated and forced to surrender rather than having to smash the enemy to bits piece by piece in a way that grinds down and degrades friendly forces.

https://en.m.wikipedia.org/wiki/Blitzkrieg

This is complicated by the fact that people will often use the word "Blitz" in English in much more general contexts to imply a process done in a coordinated, surprise, overwhelming action, so this use of the word "Blitz" is kind of between a more precise and more general usage in an awkward spot for journalists.

It gets even more headache inducing when you keep reading about the history of the word lol (from the wikipedia article)

Despite being common in German and English-language journalism during World War II, the word Blitzkrieg was never used as an official military term by the Wehrmacht, except for propaganda, and it was never officially adopted as a concept or doctrine.[8][b] According to David Reynolds, "Hitler himself called the term Blitzkrieg 'a completely idiotic word' (ein ganz blödsinniges Wort)".[10] Some senior German officers, including Kurt Student, Franz Halder, and Johann Adolf von Kielmansegg, even disputed the idea that it was a military concept. Kielmansegg asserted that what many regarded as blitzkrieg was nothing more than "ad hoc solutions that simply popped out of the prevailing situation". Kurt Student described it as ideas that "naturally emerged from the existing circumstances" as a response to operational challenges.[11]