I don't agree with this thesis because I don't seem to agree with the unstated definition of war. Was the Six Day War really a war? What about the Kosovo War?

I don't agree with this thesis because I don't seem to agree with the unstated definition of war. Was the Six Day War really a war? What about the Kosovo War? The Spanish-American War? I picked these as well-known examples of "curb stomp" events with the title "war" in them. (They are even listed at https://tvtropes.org/pmwiki/pmwiki.php/CurbStompBattle/RealLife https://tvtropes.org/pmwiki/pmwiki.php/CurbStompBattle/RealL... ). What about Anglo-Zanzibar War? It's famously the shortest recorded war in history at less than an hour. If it isn't a war, why not? Was the Spanish conquest of the Aztec Empire a war? Fewer than 2,000 Spaniards died, compared to 200,000 or so Aztecs.